Hey,

I have a 6G coupe 4cyl. I am probably going tubo in the next 8 months. I will be boosting around 5-8 psi from a custom turbo.

My question is what kind of exhaust is needed?

I don't really need a 3" exhaust do I? In other words, could I put a 2.5" on today and use it for the exhaust? These larger "turbo" exhausts that are 3" piping are mostly for 14 psi correct?

Basically, if I buy a Thermal Classic catback, will I need to throw it away when I go boost? Since it is only 2.5"?

Thanks.

BT

 

I have a friend that has a 2.5in exhaust on a Mustang with 670whp. I think 2.5in is just fine for a turbo 4cyl, thats what i got.

if you want to spend the extra money for the 3in go ahead but its not worth. I have a bigger turbo right now, but when i was boosting 16psi on my other turbo i had stock downpipe and cat and had no problems. Of course with 2.5in from turbo back with no cat the car revs more freely.

all in all 2.5in is fine, plus it sounds a little better than 3in. some 3in exhaust are very loud. just make sure you get a good straight through muffler

 

Wow man.

What did you do to build up your engine to hold 16 psi?

 

i had custom 3" mandrel bent SS exhaust with a high flow converter on my turbo accord set up at 18psi, which was still low in comparison to what the set up could handle. I figure the more exhaust flow, better the power

 

Was that for me to answer??

my engine stock can hold 20psi, I think about 5-8psi will make enough horsepower and torque for your needs. I know you will be happy with 8psi.

if you want to run more psi you might wanna get the bottom end built. piston, rods, bored, port & polish.......all that good expensive stuff.

the engine in my car is a very strong engine. To tell you the truth if you want your engine to last long once you get the turbo on get it dyno tuned. Its not too cheap but it will be done right. The people that did my car had a CRX with a 95 EX engine running 16psi with stock internals. it still runs today. it was just dyno tuned perfect that the engine can handle all that power

Thats not always true, with more flow he will lose bottom end torque. Then go 2.75in:naughty: