what size straight pipe should i run on my rb26 s13

[rbs13det]

i wanted to run a 3.5 or a 4 inch but alot of ppl tell me im an idiot for going so big .. i thought u didnt really need back pressure on a big turbo

[Mistaken]

More details on your setup?

Also do you plan on driving it on the street? 3.5" or 4" straight pipe is gonna be INSANELY loud, also probably wont sound that amazing, at least put a straight through resonator somewhere in the piping, will clean up the raspyness and quiet it down a hair.

[rbs13det]

ok 280 cams, head port polished done by head games nj , 1000 injectors running a apex power fc standalone 44mm wastegate , front mount upgraded fuel rail stuff like that low boost 380 whp right now what else would you like to kno

[EVILS14]

I run 3 1/2 on my stock 25

[rbs13det]

really ? see i knew i shouldnt listen to stupid ppl ill deff be running a 4 i just hope its not to loud

[DrifterProdigy85]

3in is good to 500hp of flow. Anything above that you should run 4".

[monkeyballs]

im using a 3.5 inch d/p, 4" qtp cut out and straight 4" out the back

[Chaos the Xile]

I/'d run a 3.5" dp to a 4" pipe out. the clearance of a 4" pipe off the turbo in a lhd s13 will be an absolute BEEOOTCH!

[monkeyballs]

im wanting to run a 4'' off the turbo, the next time i have the turbo manifold off the car im going to reroute the number 6 runner so the d/p can clear it. hopefully this will work for me

[rb25det250sx]

i run a 3.5 inch HKS hi-power wit a 4.5 inch out and a high flow resinator... sound beaf***ingutiful... but the bigger the better... on a turbo car you do not need any back pressure.

[Cjmartz2k]

"Needing some backpressure" is a completely bulls*** myth, for both turbo AND n/a cars. Read and learn........

zer...stion

[RBTALLY]

my 240 has 3" and put down over 600. so use what ever size u want but due it becouse you want it not becouse you think you need it... my outlaw car put down 1400 on low boost through 5" when I switched it to 6" aluminum I did it for looks and weight not air flow..just my 2 cents..

[gawdzilla]

anything straight pipe is going to be loud. 3, 3.5, or 4. 3.5 and 4 are harder to fit. depends what your power goal is. over 600whp i'd say do a 4. otherwise it's just more expensive and harder to fit.

[rbs13det]

word thanks for all the info ill deff be running a 4 umm what a great daily =]

[Mistaken]

Ide suggest at least throwing a bullet muffler inline or something to clean up the rasp. It will quiet it down a hair without effecting the flow very much, and clean up the sound a lot. I'm going 3.5" or 4" with my VGT setup this spring but im planning on running a bullet muffler to at least clean up the sound a little bit. I'm not to worried about noise level since the VGT at full closed A/R will quiet it down a lot.