My question is should i go with a single pipe or dual pipes?

Also does anyone know what the stock pipe size is on the stock exhaust? Considering mine didnt have an exhaust when i bought it.

 

btw its an 87 s4 turbo II. stock from the air filter to well now the catalytic converter

 

I've driven v6's my whole life, and still get surprised by my n/a fc's fuel consumption, i hope your prepared for it.

I think single and dual is simply in regards to how you've built your car. If it's a stock vehicle, I'd just leave the exhaust stock. I believe it's a 2.25" pipe. Someone else can correct me if I'm wrong.

 

but mine is a turbo II and i plan on modifying it so i wanna make it breathe easier. so starting with intake and exhaust just to start

 

the stock ID of the exhaust is 50mm. 3" is a great upgrade.

 

Thanks j9fd3s

 

http://www.racingbeat.com/mazda/perf...gurations.html

Some helpful hints there =)

 

Thank you luthor. Definitely helped. Good info

 

personally id say go with the racing beat full exaust system that sapposiadly ads 56hp if its any gain like that id do it and am going to do it to my 87 tII

 

Single or dual exit is really a personal preference thing. A single exit exhaust will be a little lighter. The racing beat system (dual) is great if you want a mellow tone, great quality and good power, but I've heard it's quite heavy. It's also on the more expensive side. If you like the single exit look better and want to save some weight look into the Apexi or HKS systems, but these are also going to be on the louder and more expensive side. Corksport (single) is a cheaper option at around $400 I believe, as well as various ebay systems. If you really want to free up the exhaust I would also get a downpipe and delete the catalytic converter.

If you're going to free up the whole exhaust system make sure you get a fuel cut controller or an Rtek ecu chip to prevent fuel cut from the excessive boost that is a result of a modified exhaust on turbo models.

And another thing to look into if you free up the whole exhaust is to port your wastgate on the exhaust manifold, this will help with the boost creep problem.

Lots of good info here...
http://fc3spro.com/TECH/FM2W/power.htm

Explore that site as it is dedicated to Fc Turbos.

Hope all this helped! And anyone please correct anything if I made a mistake.