Lets face it, the quad exhausts are the single biggest giveaway on the M5, and for both security & on-the-road stealth reasons (nobody wants to race me thesedays), I've decided to perform the following exhaust conversion.. I think the furthest most have gone (from reading thru the forums) is debadging and maybe a 528i decal on the bootlid, but this takes things a step further (Remus will fabricate a special order tailpipe onto their rear box for an extra fee). My only real concern would be a probable increase in back pressure and resultant drain on power,. would the (more free-flowing?) aftermarket sports box help counteract this effect and maybe balance the equation of removing one complete side of the M5s rear exhaust section ?
Is there any real benefit in having 4-exhausts on the M5 anyway? I mean what impact (if any) would removing one muffler have on the engines output.. or could it be something to the order of -10 bhp ?. Considering the Alpina B10 makes a fairly healthy 375bhp from its 4.8l V8 with a 540i type exhaust (only with sports silencer)..
Any thoughts on this ? Anyone got a 520i badge lying around :2: