picking up a header and cai tomorrow, and was thinking of redoing my whole exhaust since i'm pretty sure i have to replace my cat anyway. i was looking at getting a magnaflow 2.5" cat, and probably a cherry bomb glass pack with a dynomax super turbo muffler(2.5" in/out). not having the money for mandral bent tubing at this moment i was thinking of getting aluminized 2.5" crush bent(as it's what most shops around here have most access to). i know it's not the most performance oriented way of bending the tubes but it's cost effect and will be larger in diameter then stock.
My plans for the car for the next year or so are pretty basic and include a 1.8l cam and getting my stock tb bored out a little bit,as well as a 1.8l ecu,wit the possibility of a saab 3" maf(depending on the size of the cai i'm getting).
just wondering if you guys think this will flow decently well,or if 2.5" is too big or small.
i know i should be going with manderal bent but where i live the closest place to a manderal bender is like ontario or some shit like that. also is there any paint i can apply to the piping that will help hold in the heat and protect the piping?

 

that should be fine, but with crush bent pipe you could even go up to 3inches in diameter, just cause the crush bent pipe restricts flow a little bit. but 2.5 will do just fine

 

^^^
thanks for the input i was thinking of going 3" but figured might be too much for NA,but i guess if it's crush bent yeah it would work,just cost a bit more haha. i'll have to call around and get some pricing

 

<div class='quotetop'>QUOTE (JDN902 @ Jan 29 2010, 06:40 PM) <{POST_SNAPBACK}></div><div class='quotemain'>^^^
thanks for the input i was thinking of going 3" but figured might be too much for NA,but i guess if it's crush bent yeah it would work,just cost a bit more haha. i'll have to call around and get some pricing</div>


i have 2.5 crush bent on my beta accent... i didnt notice any power loss down low but gained alot after 4k..

if i let it get to 4k in second and mash it u almost go through the seat loll not really but it throws u back...

but this is comparing to my obx header to stock accent 1 7/8 or some shit lol... but yea should be no prob i ran 3" mandrel on my 240 n/a and had nothing but gains low to high it was a 2.4l before i swaped it for my 1.8l. but yea youll be fine.

 

excellent that makes me happier with my choice haha. thanks for the info man,glad i'm not the only one going crush bent haha

 

You should have no problems with the 2.5" especially if it's crush bent. I had 2.5" mandrel with a stock manifold and as stated above, all I noticed were gains, especially in the higher RPM range

 

Yup. 2.5 on mine, mandrel bent all the way, nothing but power on demand.

I'll be going the exact same route on the Soul.

 

you might be suprised what madrel bends from jegs cost. i ordered two 2.5" mandrel bend u-tubes along with two 4 ft. chunks of straight tubing pretty cheap.

here is all i ordered along with the jeg's numbers for the gf's exhaust on her car.

magnaflow 53006 catalytic converter 2.5"in/out
item# 642-53006 $64.99

Dynomax Super Turbo Muffler model# 17733 2.5" in/out
item# 289-17733 $46.99

Dynomax Thrush Magnum Glasspack 2.5"in/out 28" body length
item# 289-24214 $26.99

JEGS Universal Flex Coupler 2.5"I.D.x 6"Centerx10"O.A.L
item# 555-30771 $37.99

JEGS Exhaust Tubing (Aluminized) 2.5" O.D.x48"
item# 555-30610 $13.99

Hooker Headers/Dynomax Exhaust Tube Mandrel Bends
Mandrel J-Bend - Aluminized Steel
Tube OD: 2.5"
Radius ®: 3.5"
16 Gauge
item# 289-42392 $17.99

 

will this work in a 1997 tibu?

 

goku350z2007, please use the Add Reply or Fast Reply features rather than Quoting the last post in a thread. New posts are generally assumed to be in response to the last one, and Quoting the last post makes us read it all again again.



That list is pretty universal. Add a header and maybe some flanges and you've got an exhaust after a few hours with a saw and a welder.