M3 exhaust and cold air intake

[kduffy]

I am interested in changing out my current stock M3 exhaust and adding a cold air intake to my 2003 M3 coupe. I would be very interested in any comments, experiences (positive and negative) and product recommendations. I am new to this site and to the San Diego area. Does anyone know of a good BMW mechanic / tuner?

[Hugo]

I don't have an M3, but an 318iS. But the idea is generally the same: create less backpressure. What I did is the ultimate budget exhaust. I bought a free-flow universal cat, and two cherry-bomb dampers from JC Whitney. I then fabricated the pipes from PVC (home-depot) and had the pipes replicated by an exhaust-dude in steel pipes. Complete freeflow exhaust incl cat done for US$250,- Nice, eh?

The ECU of the M3 should cope with the reduced backpressure and it should give the odd extra HP. But don't expect miracles, I just did it because I bought the car without exhaust!

Don't know about the cold air intake, didn't get round to that, yet.

Regards,

Hugo

[TTek]

The E46 M3 has cats as part of the headers. Until you change to either the euro set up or supersprint you will not free up much back pressure.

[revhigh]

E46 M3 partsBMW V8 DIY site

Roadfly classifieds for the E39

"A witty saying proves nothing."



last dyno sheet more to come N/A

[Hugo]

[Hugo]

I was thinking euro set-up, because I'm Dutch. But with a universal cat, I think one should be able to get thru the emmisions test.

Hugo