Jump to content
SAU Community

Recommended Posts

what size exhaust is best for an r32 RB25DE?

i currently have 2.25 inch from the headers which was installed by pit stop , after 5 attempts they believe this is the best exhaust yet, it has great top end.

what size do you all recomend?

2.25 " or 2.5 " both with no cat an an x force 2v03 4" canon tip

Link to comment
https://www.sau.com.au/forums/topic/336951-rb25de-exhaust/
Share on other sites

Another one of these exhaust size threads again?? Dewd try search before your next thread.

I will nominate 2.5" as it gives a nice mid range and a good top end. I have also had experience with 3" catback that is why I say 2.5". Never tried 2.25" by the way.

Link to comment
https://www.sau.com.au/forums/topic/336951-rb25de-exhaust/#findComment-5449242
Share on other sites

When i got my exhaust done about 3 years ago i had no idea about sizes, i just told the shop to give me the best performance and they installed a 2 1/4 inch exhaust.

feels nice down low and up to about 5000 RPM but after that the engine starts screaming and the power starts to level out. Very nice pull down low tho like i said, makes town driving fun and you don't need to use much throttle.

I'v got a rb25de neo tho, not an r32 25de

Edited by R34 -_-
Link to comment
https://www.sau.com.au/forums/topic/336951-rb25de-exhaust/#findComment-5449277
Share on other sites

  • 2 weeks later...
what size exhaust is best for an r32 RB25DE?

i currently have 2.25 inch from the headers which was installed by pit stop , after 5 attempts they believe this is the best exhaust yet, it has great top end.

what size do you all recomend?

2.25 " or 2.5 " both with no cat an an x force 2v03 4" canon tip

I had a R33 half a year ago with a 2.5 inch catback which i got from a local exhaust shop. straight away after installation i realised the car doesnt pull as hard as the stock and its loud as. But after a month of driving the car seems to adapted to the exhaust and actually went quiet well. 2.5 inch seems to be ok for the Rb25. but make sure you get a good muffler tho as those cheap ones sound crap and drony, and can also get EPA'd which i did. LOL

Link to comment
https://www.sau.com.au/forums/topic/336951-rb25de-exhaust/#findComment-5467545
Share on other sites

i have no idea about the 32's but my car that i sold a few months ago (r34 NA) had a stock exhaust and just yesterday i met up with the new owner and took it for a drive with a new 3'' catback. I must say i was impressed!! a bit slower of the mark but as it climbed the revs i could notice the difference :P

Link to comment
https://www.sau.com.au/forums/topic/336951-rb25de-exhaust/#findComment-5467800
Share on other sites

Really? I would think you would notice a difference straight away with a new exhaust? That puts me off getting one installed on mine

he probably didnt reset his ecu after he put it on so it would have takin a lil while for the ecu to change its settings

in my opinion a 2.5 is about as big as you really wanna go. you can go bigger but theres not much point!

it will give a nice top end over the 2.25 which is still nice in its own way and will still peform just make sure its done with mandrel bends which arnt much more expensive (that includes on a 2.5" exhaust).

and dont be a dick and try and make it as loud as possible, have some respect for others and families (plus less attention from cops)

Edited by Mad-Max
Link to comment
https://www.sau.com.au/forums/topic/336951-rb25de-exhaust/#findComment-5470440
Share on other sites

the amount of 'learning' that the stock ecu does is very little. the HP difference will be very minimal. however the seat of the pants dyno does do a bit more learning. you may do a mod, then have it feel much better or worse, but if you keep driving it you start to get used to the difference and then not notice it as much. having said that, going to a 2.5" system over a stock system if you are going to notice a difference you will notice it straight away. it won't slowly improve. every car i've ever changed the exhaust on, when it has made a difference i've noticed it in the first 100m of driving.

Link to comment
https://www.sau.com.au/forums/topic/336951-rb25de-exhaust/#findComment-5470893
Share on other sites

Yeh i've heard a few times that you can go 3' catback(with a cat) or 2.5' with a cat. Of course with the 3' you are going to loose that low down power but in the higher revs you will notice the engine open up more. I even noticed the difference in power when i chopped off the stock tips with the butterfly valve, now its much deeper but seems a bit slower low down but faster higher up.

Link to comment
https://www.sau.com.au/forums/topic/336951-rb25de-exhaust/#findComment-5476481
Share on other sites

Yeh i've heard a few times that you can go 3' catback(with a cat) or 2.5' with a cat. Of course with the 3' you are going to loose that low down power but in the higher revs you will notice the engine open up more. I even noticed the difference in power when i chopped off the stock tips with the butterfly valve, now its much deeper but seems a bit slower low down but faster higher up.

and unless you spend all your time above 5000rpm then the 3" is just a waste of time and will attract unwanted attention from cars with disco lights on the roof.

Link to comment
https://www.sau.com.au/forums/topic/336951-rb25de-exhaust/#findComment-5477942
Share on other sites

i have no idea about the 32's but my car that i sold a few months ago (r34 NA) had a stock exhaust and just yesterday i met up with the new owner and took it for a drive with a new 3'' catback. I must say i was impressed!! a bit slower of the mark but as it climbed the revs i could notice the difference ;)

3" FTW :(

Link to comment
https://www.sau.com.au/forums/topic/336951-rb25de-exhaust/#findComment-5478414
Share on other sites

lulz. in an N/A 2.5 you'd be going backwards anyway. I didn't even run an exhaust that big on the 5 litre V8 I used to have!

BTW catbacks don't really make any difference for power.

but if you want it to sound like a Lancer dumping out of the headers, then go right ahead :down:

Link to comment
https://www.sau.com.au/forums/topic/336951-rb25de-exhaust/#findComment-5481867
Share on other sites

lulz. in an N/A 2.5 you'd be going backwards anyway. I didn't even run an exhaust that big on the 5 litre V8 I used to have!

BTW catbacks don't really make any difference for power.

but if you want it to sound like a Lancer dumping out of the headers, then go right ahead :down:

yes but you have to remember that half of the older V8's came with the same exhaust size as the 6 cylinders in the range.

Link to comment
https://www.sau.com.au/forums/topic/336951-rb25de-exhaust/#findComment-5481960
Share on other sites

I was referring to aftermarket. 3" on a stock 5 litre has much the same effect as sticking it on a stock 2.5 N/A.

So given that 2.5" is adequate for a stock engine twice the size, why would you go bigger than that? (especially when N/A Skylines don't sound very good to start with lol)

Link to comment
https://www.sau.com.au/forums/topic/336951-rb25de-exhaust/#findComment-5482054
Share on other sites

oh i'm not saying that anyone should go a 3" on a NA skyline because i agree that it is stupid, and the gains made at high rpm are more than outweighed by the losses at low rpm. i misinterpreted your post a bit. when you said "in a NA 2.5 you'd be going backwards anyway" i thought you were meaning a 2.5" exhaust

Link to comment
https://www.sau.com.au/forums/topic/336951-rb25de-exhaust/#findComment-5482157
Share on other sites

Guest
This topic is now closed to further replies.


  • Similar Content

  • Latest Posts

    • So stock ECU does not like anything above 10 psi?  That Nistune one is just for "try" if it will be any different, I know it need to be tune for that. I know but YOU may know about these problem but i/we dont. They few little Skylines here let alone people who know anything about tham so that is why iam asking here  
    • So now we have a radiator with no attachments whatsoever. It lifts up with a particularly tight spot between the drivers side air box mount and the lower radiator outlet, but if you've got this far you will sort that too. This is the lower mounts with the rad out so you can see where the rubber bushes go, it is a straight shot upwards Done! Assembly is the reverse of disassembly, with blood less likely to be shed.
    • Right, onto the second last trick. The Air Con condenser is mounted to the front of the radiator and stays in the car when the radiator is removed. There are 2x 10mm headed self tappers holding the top of the condenser to the radiator, remove those The bottom of the condenser is attached to the radiator with clips. You need to lift the condenser out of those clips and clear (up, then forward). f**ked if  could work out how to do that last bit with the front bumper on. I hope you can, and you share the trick.  Bumper removal probably deserves its own thread one day once I've recovered the will to live, but basically you need to remove the wheels, front inner guard liners (clips and 10mm headed bolts), the self tapper between the guard and the bumper at the rearmost point of the bumper (same as an R32 that bit), any remaining clips at the top/front of the grill, an absolute bastard design with a plate that holds the top of the bumper above the headlight each side (only 1 bolt which is tricky to get to, but the plate catches 2 places on the bumper and must be removed....carefully!) and push clips between the bumper and guard under the headlight. If you've done all that you will be faced with wiring for the fog lights on both sides and in ADM Q50 RS at least, 4 nasty tight plugs on the driver's side for the ADAS stuff. So, the clips at the bottom look like this on drivers side (looking from the front) And on the passenger side (also from the front), you can see this one is already out Clearance on both of these are super tight; the condenser needs to move up but the upper rad support mount prevents that, and the radiator can't move down far because it is (rubber) mounted. Once you achieve the impossible and drop the condenser off those mounts so it does not stop the rad moving, you are good to go
    • OK, next the shroud needs to come off and there are a couple of tricks. Firstly, there is a loom from near the passenger side headlight to the fans, coolant temp sensor etc and there is no plug to undo.  In my case I was OK to leave the shroud on top of the engine so I just undid the passenger side fan plug and about 10 of the clips which gave enough free wire to put it aside. The fan plugs were super tight, the trick I used was a small falt screwdriver to push down on the release tab, then a larger flat screwdriver to lever the plug out of the fan unit....be careful with how much force you apply! If you need to remove the shroud altogether for some reason you will have to deal with all the plugs (tight) and clips (brittle)....good luck. I removed all of the clips and replaced them with cable ties that I will just cut next time. Also, in the Red Sport / 400R at least, the intake heat exchanger reservoir hose is bolted to the shroud in 2 places with 10mm headed bolts; so remove them (the hose stays in the car; no need to undo it at the t fittings down at the radiator lower mount. Once you've dealt with the HX hose and the wiring loom, there are 3x 10mm headed self tappers holding the top of the shroud to the radiator; remove those.   The shroud then lifts out of the bottom mounts where it sits on the radiator, up and onto the engine out of the way. Simples
    • Ok, disregard my “rate them” comment, sorry for my unrealistic input
×
×
  • Create New...