performance upgrades
Do a little homework and talk to the dealers, ask around. Ultimately the best is the one you feel more comfortable with and hopefully is close to you. Here are some sites to get you started:
www.awe-tuning.com (GIAC)
www.stratmosphere.com (ABT)
www.hoppenmotorsports.com (MTM)
www.goapr.com (APR)
Good luck and let us know how it turns out.
Abt/AMS and Wett both make TUV approved chips. TUV is kind of like ISO here in the USA. Could be a peace of mind thing for you. Consider how long a chip maker has been in business ( will they be there if you have a problem ), how extensive their R&D really is, do they have a good relationship with dealers and AoA should questions come up ?
Rear muffler becomes a real point of constriction. You hear a "sandblaster" sound if this is the case. Rest of the exhaust is OK.



