I have an MY02 WRX. standard down pipe and centre section, but a TSL Gp N back box.

If I change the centre pipe to say a Magnex, would I see any noticeable performance improvement, power delivery change?

Have searched previous topics, with no clear answer..

 

Very little gain from center with std downpipe, however, noticable gain if done with a decat downpipe.

Moral of this is do the downpipe first.

On your car the uppipe is fairly restrictive also.

Andrew...

 

Do a search, there has been lots of debate on this or try Hayward and Scotts website. they have published figures on their own system