hey, im getting a D15B vtec installed. i plan on runng full exhaust with 2.25 mandrel bent, a random tech hi flow and a megan racing muffler. couple questions.

1. im going to be using the stock headers when running the exhaut but plan to eventually get aftermarkets. will there be any fitment issues?
2. for the inlets and outlets on the cat, do they have to be the same diameter as the pipeing?
3. since im using a D series engine will there be any fitment issues with the aem v2 for the 5th gens?
4. What is Mugen stuff?

 

reuse your existing flanges... header will usually be bolt on, exact fit.

 

overpriced.

 

over priced ya but is it like a brand or style or what?

 

brand