i got some rotary engineering headers but im wondering will they bolt up to my stock exaust???? i have a s4 n/a

 

??????co'mon ppl

 

they should just bolt on but you will still have your main cat hooked up to it though! i'm not sure if it will eliminate the two precats or just the 1st pre-cat!

 

no.

 

ok then i might be wrong

 

Another example of posting useless information. If you have a dieing need to post reactions to threads, go to the lounge.

~Mike...........

 

the header it should bolt up to your block but to the rest of your exhaust i have no clue

 

RE headers have dual outlets. the stock S4 exhaust merges before you even get out of the stock manifold. to use that header, you will NEED custom work.

1. either get a collector and flanges and have it grafted into your stock system, or
2. have a complete system fabricated, or
3. get a header that will bolt up to your system.