Opinion On My Exhaust System Please

[BANGN]

Greetings,

I have a 5zigen steel system, its a 3" system and it is pretty quiet and delivers a nice note on boost.

However I am intested in knowing if the system I have is good for the application. I am running a RB20 on a 25 turbo and currently the car outputs 235hp atw with a stock dump and down pipe.. I have recently purchased a stainless screamer for the car (awaiting delivery) and I am trying to reduce backpressure in my exhaust system as I would like it to be up to scratch and not be limiting the car.

its a mandrel bend setup which contains a cylinder like muffler where hte cat would be normally and a middle muffler which basically continues as 3" through it and you can see straight through..and leads to a back muffler which is also 3"

so my questions are -

- will replacing the centre mufflers with regular 3" pipes be a worthwhile modification

- will it make it unbarably loud? I dont like a loud exhaust on the fwy making your ears numb

- should I leave it as it is?

- it has been scraping and hitting on the middle muffler anyway and perhaps removing it would increase my ground clearance but then its back to teh noise level again & I am unsure how loud these are with only 1 muffler and no cat..

- is the exhaust too small or is it a correct size for the application, I would like somthn thats going to be like perhaps 250hp - 260atw

thanks - i cant upload pics atm my pc is being a penis

[saliya]

Can't make a guess as to whether you should leave it as-is but:

- it has been scraping and hitting on the middle muffler anyway and perhaps removing it would increase my ground clearance but then its back to teh noise level again & I am unsure how loud these are with only 1 muffler and no cat..

You should be able to make/get an offset muffler and rotate it to suit; it won't be

_exactly_ the same muffling as a centred one but it will be better than straight pipe.

Regards,

Saliya

[BANGN]

it hits on the base of the edge of hte muffler so rotating it will only make it worse, it catches on low driveways

[R31Nismoid]

One muffler and no cat generally is quite a bit louder, the 2x muffler setup does get them down to a reasonable level... especially if its a cannon on the end, lots of noise

Either way, 3" wont pose a restriction mate... certainly not the RB20 and a RB25 turbo, you'd need to be making closer to 400rwhp before worrying about a 3" exhaust being a problem

[dmr]

on my RB20DET i have a hiflow cat, small oval centre muffler, and hotdog rear muffler.

my old setup was hiflow cat, big oval centre muffler, and big oval rear muffler.

i saw no power difference with the old quietened exhaust to the new one. the only difference is the loudness and deeper note.

as R31Nismoid said, you won't see the difference in restriction at low power.

Edited April 28, 2008 by dmr

[BANGN]

so basically dont worry about removn the mufflers for the power I want, i mean i cant see the mufflers being restrictive as its straight through.. not the normal style mufflerwhere it enters one side.. has another pipe inside hte muffler it has to meet on the other side of the barrel and make it out that way if u know what i mean

[R31Nismoid]

Even if it wasnt the best designed system in the world i wouldnt be worried for your setup mate

[BANGN]

cool thanks for your help.. you all just saved me time effort and money LAWL .. id rather it scrape that have extra noise

Edited April 28, 2008 by BANGN

[BANGN]

ok well i picked up the downpipe from the back of my shed asuming it was 3" but no.. its 2.5 gayness.. so means im guna have a larger dump/screamer then 2.5 then 3" with the rest of the system