Quote Originally Posted by green91
Technically it is ILLEGAL to modify emisions control systems in any way. Have fun failing visual inspection!


Funny you'll support a country club (expensive) race track and justify the cost of membership, yet you won't even spend money on the most elemental power gains on a car (exhaust) and want to have some half ass rigged up exhaust on a BMW.
u cant get power gains from boltons with my car... only way possible is to upgrade the ECU. im not turning my A/T BMW into a race car... i have other plance for that. Yes i plan on taking it to the track... yes i want to have some fun in it. No i do not see myself spending $1000+ to bolton a catback that gives me 4+ hp gains.

The resonators that would be replaced work as SECONDARY cats... no sensors. its legal.... and i'll still pass emissions... do some research.