Exhaust Options: Is It Better To Keep This Big One Or Go Back To Standard?

[zei20l]

ahh sorry i should have explained better, yeah upgrading from the stock dump is a good idea. but i rekon changing from a 2.5" dump to a 3" will do stuff all. there is no back pressure required on a turbo car, there is already enough there supplied by the turbo

if the pipe is TOO big, especially off the back of the turbo, then the air wont flow away from it, it will come out the back and 'billow' around and create flow problems. the air is still hot and expanded already, so velocity is required (more so) to move it away from the back of the turbo faster, as it cools, i guess it doesnt matter, its waste anyway........

any one know if there are tuned length headers available for a VQ25DET?? i got some wicked spool times when i changed my manifolds on SR20s

[iamhe77]

any one know if there are tuned length headers available for a VQ25DET?? i got some wicked spool times when i changed my manifolds on SR20s

Haven't come across them yet.

In fact, I haven't come across many heavily modified VQ25DET's.

Edited May 29, 2009 by iamhe77

[zei20l]

i guess there isnt much room in there to play anyway. plus it will generate more under-bonnet heat too........... hmmmm

[iamhe77]

i guess there isnt much room in there to play anyway. plus it will generate more under-bonnet heat too........... hmmmm

mmm under-bonnet heat....

I do like Masa's partial solution to the heat issue with the externally venting front quarter panels.

Dolphin made a vented CF bonnet, but I think that productions ceased on that a while ago...

[andy65b]

i guess there isnt much room in there to play anyway. plus it will generate more under-bonnet heat too........... hmmmm

Don't forget that the right manifold is coming around the back of the block between the fire wall and joining the left manifold at the turbo.

It would be very difficult to tune the length too much unless you go twin turbo.... Now there is an idea...

[zei20l]

yeah thats not a bad idea, except for the intake manifold would need to be adjusted..... maybe........

[iamhe77]

Don't forget that the right manifold is coming around the back of the block between the fire wall and joining the left manifold at the turbo.

It would be very difficult to tune the length too much unless you go twin turbo.... Now there is an idea...

Ahh yes.. TT. An idea that has been kicked around in my head for a while.

Would need pretty decent $$$$$'s to do it and, preferably, another intake box on the left of the engine as well as 2 return piping FMIC's... ooh yeah

[zei20l]

actually would it REALLY be all that much work. after thinking about it, just a dual input FMIC and piping from the turbo to suit might do it. i mean besides all the exhaust manifold piping etc and the turbo mounting, oil and water lines, exhaust..... a lot of work, but possible!

[iamhe77]

actually would it REALLY be all that much work. after thinking about it, just a dual input FMIC and piping from the turbo to suit might do it. i mean besides all the exhaust manifold piping etc and the turbo mounting, oil and water lines, exhaust..... a lot of work, but possible!

lol. Anything is possible with the right $$$'s and expertise

[zei20l]

hmm $$$$ now i need to get me some of that!!

[Houdini]

you checked the x-force range for twin tips ?

yes sir, that's what I got!

[Houdini]

[nickcorr]

Very noice.....

and if I may ask, what did that cost you? Also, which of the XForce Mufflers is that one?

Much as with my R33, the fake trims on the dual pipes is starting to get to me, different is that with the R33, a swap to a full GT-R cat-back with proper dual pipes was only $120 and 1 hours work fitting it away..

Edited May 29, 2009 by nickcorr

[[[d a n n y]]]

is it loud?

[Houdini]

is it loud?

It's got a nice tone, real V6ie sort of noise, actually same as the big apexi but quieter. I was told it was legal ( < 95 Db's) ...and it indeed passed rego inspection yesterday.

It still sounds nice, actually I can hear my turbo and intake sucking air more clearly now and the BOV sounds louder too

[zei20l]

so you have the old exhaust still? or did you have it modified?

[Houdini]

so you have the old exhaust still? or did you have it modified?

got it, just haven't got around to contacting the "new owner to be yet"

[zei20l]

you better hurry dude lol

if you can make the stagea meet this coming weekend, bring it with you! its a public holiday the next day.........

[iamhe77]

the fake trims on the dual pipes is starting to get to me

Understandable.

Have you noticed that in the case of the OE "dual" pipe muffler, only one of the pipes is actually spitting out gasses?

The other is just for "show".

[nickcorr]

Fark!!! Just checked...

Only the outside one is connected to anything!! I feel cheated..

At least the OEM R33 GTS-T muffler was a genuine twin outlet.

On the plus side, a new muffler, now counts as a performance mod, rather than just a cosmetic change...

Understandable.

Have you noticed that in the case of the OE "dual" pipe muffler, only one of the pipes is actually spitting out gasses?

The other is just for "show".