Hi all, currently have an Apexi Exhaust fitted and I want to replace the downpipe with a sports cat and replace the headers to standard ones which have been ported.

I keep hearing headers and uppipe though? Maybe a stupid question but hey if you don't ask you don't learn stuff, but what is the up-pipe and where about is it fitted?

 

the up-pipe connects onto the turbo inlet & the exhaust manifold (headers)

cheers

 

If you want advice on headers, up-pipes etc, PM Harvey Smith, he posts on here as harvey.

VERY knowledgeable bloke.

 

^^^^^ What tt says

 

http://www.subaru-impreza.org/forum/...t-diagram.html

I found this diagram helpful when I first started..........and still do LOL Not every impreza is the same though ................

Shaun

 

I have sent him an e-mail but not heard anything.

It was only yesterday though.

 

Try a PM, he's busy, and might also be ill.
I can point you at a phone number for his garage if you need it, PM me.

 

Pm sent mate.

 

So by replacing the up-pipe what does that achieve?

 

Some uppipes help spool.

 

if the up-pipe is correct then the exhaust gasses from the engine hit the turbo at maximum efficiency........which spins the turbo faster ........which forces more fuel and air into the engine = more power and torque

Shaun