Quote:
Originally Posted by topgearlambo
Anyone modded their exhaust sytem for the 550 yet?? I'm thinking of purchasing the meist SUS- GTS from gthaus.com. Comments? Feedback? Thanks!!
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I would check the "flap-valve" on the original exhaust, and find out if it affects back pressure and how/what they do to get round it, sometimes changing the exhaust with this on it to removing it LOWERS bottom end torque, just check this first. However some people say it "Increases it".