How many of you are running a DC JDM header wit the 2.5 collect wit a high flow 2.5 cat with a standard exaust like the Apexi N1 which is not 2.5?. Im getting ready to purchase my header and will be faced with this problem so i was wondering how the set up performs and what problems it faces.

thanks.

 

i know you'll notice drop in power....i had the same 2.5 to the cat and after the cat had to use stock exhaust and it was like night and day when i run it open header

 

im not running a stock exhaust, I said imma have 2.5 all the way to the Apexi N1 piping

 

mm..k, you still loose power, just not as much

 

ok i will probally look into that 2.5 custom this summer after i get the Cams and pistons. And if i get lucky to get threw emissions.