Exhaust Size

[j-qual]

a lot of people say that a 3" exhaust system is far too big for a naturally aspirated engine, and swear buy putting a 2 1/2" is buy far the best option.

im interested to hear what systems people are running on there n/a's and there 2 cents on the matter

which do you think is the better choice? 3" or 2 1/2"

Edited April 24, 2009 by j-qual

[natho33]

Ive got 3 inch with the car

havent driven one with 2.5inch

I get heaps of complements with the silencer out sounds insane, with silencer in it sounds quiet as stock

Performance feels better than standard exhaust aswell i think

[Mr.Massive]

hey, i got some 2.5" twins n it sounds fine, however i spent like $200 on a hi performance muff.

before i had a str8 4" cannon. = i couldnt hear anyone inside the car whilst driving.

NAs are alot louda than FIs id so if you like the big 3" i sujest a gd muffla = still sounds sporty and you can hear the cd player playn aswell

[Eug]

g'day james,

this topic has been covered quite extensively throughout the forums. it was proven that you can get away with a 3" system without too much loss of volumetric efficiency on an R34 RB25DE NEO however on an R33 a 2.5" system is considered ideal.

in your case if you are looking for an increase in peak power go 3" and if you're looking for response along with a mild increase 2.5".

have a search throughout the forums and you'll find loads of info supporting those.

[MissR34]

this is my girl, with her 3" Trust exhaust......i love the sound that it makes

Edited April 25, 2009 by MissR34

[(OO)SKYLINE(OO)]

You could even go a 2.25" exhaust system...

I had a 2.25" on my Datsun 280ZX (2.8lt inline 6 SOHC, 12 valves) and it worked fine!

[j-qual]

yeh thanks guys and girl for ur input on the topic..

i thought the 2.5" was the right way to go...

im just worried about the car being to loud once i get the system fitted. atm i have a 5"canon on it and it sounds like shit (came with the car, i thinking its a no brander).... so wanted something sounding a little meaner.... i was gonna change the canon but as i said worried about the loud deep drone most na's have. and now im thinking of putting a fresh system in it...

r33 na's are stock 2.5" yeh ?

[GTS25_R33]

gday buddy,

i just got the exhuast done on my 33 n/a. i was keen on a 3 inch but every place i went to said there was no way they were goin to put one on it, its just too big for a n/a, and lacks pick up somethin shockin.

i went with a 2 1/2 inch, extractors, metal cat, and straight through muffler, the resinator is comin off soon but i think it sounds awesome, has a really mean idle, and all the way through the rev range.

thats just my 2 cents worth any way