I am going to replace the exhaust system with either a Borla or a Stillen exhaust system. Which is better?
neither, the Invidia is the best for both sound and performance, also price. The Invidia N1 is about $700 for the dual outlet model and made 15 rwhp on a STOCK car, the Stillen model dual exhaust with crossover made 12 rwhp and costs $1,200, the Borla sounds like crap, and made 11 rwhp on a stock car and costs about $700 also. I changed from a Stillen dual outlet to a Invidia and it was a NOTICABLE difference in both power curve and throttle response. If you are interested in the Stillen exhaust, I still have it and will sell it for $450.
stillen it wwill get a better sound and more preformance then a borla thoes are mostly for sound
Depending on which 3 series, I would say the BMW. If it is a 330i or 335i then I'd say get the Beamer. Not positive but I'm pretty sure the 2006 335i has a twin turbo i6. If its a 325i or 328i then you probably want the infiniti because that's a 3.5 litre and it will have more power. If you want it to look lowered, lower it. Don't try to make it look lowered with a body kit and wheels as you will sacrifice a lot aesthetically if you go down that road. If you are willing to drive a lowered car it is worth it to get the modified suspension, it will handle better and those cars look better with wheels that fit the wells, and I think 15's might look a bit weird on either of those cars. As for a body kit, try and go with something subtle, an aggressive looking lip is always good but subtle, restrained sideskirts and fenders have always suited my taste better.
