TClark1976 Posted April 10, 2009 Report Share Posted April 10, 2009 So I made it down to CS86 in Vegas for Mr. Shelby's Birthday Bash. That just happened to be my birthday weekend also! I did not have my SGT there, man was I bummed! I'd only spoke with everyone on TS Forum or on the phone, so needless to say, I didn't think I was going to get any track time with anything but my V6 Mustang rental car. I was able to drive Jim Clark's '08 Kenne Bell GT/SC (If you wondered - Jim and I are related - we found that out through Team Shelby and the luck of owning a '08 Shelby GT) and "Lulu" Mac's '07 Shelby GT. (Special thank you to both of them for making that weekend one that I'll never forget! and for letting ME take their cars out on the track!!) Most of what stood out to me was the exhaust note of each car. Some were bone stock, other's were very modified. Some sounded rather quiet, and other's made "thunder" that shook my ancestors. Which led me to realize that the stock SGT exhaust is actually rather quiet. For some, it's perfect - I'm just not one of them. There was one car, a 2008 Vapor GT500 with black stripes and 20" Alcoas there. Every time that car would go by it was muisc to my ears! It was at that moment that I made up my mind I wanted THAT exhaust note for my SGT. After a month or so of discussions and finding the owner of that car, learning of the MAC Performance "MMS Custom" and what it really involved, waiting on production/shipping, I finally got my new axle back exhaust installed. This is my first attempt at making several video clips into one video - I'm a rookie at it - here ya go!! YoutTube: Stock manifolds / Stock Cats / Stock X-Pipe =======> 1st impressions? Everyone was SO concerned about the cabin drone - I will admit - 65mph in 5th at about 1800 RPM you get a good "Solid" rumble from the exhaust which I rather prefer. None of the drone everyone has written about, and at 2000 RMP, it's gone completely and at cruising speeds, all you get is the perfect rumble, just about the same as the stock. At WOT though, it sounds EXACTLY how I wanted it to sound! Seat of the pants dyno? Believe it or not - I actually gained a little in the area of throttle response. The MAC mufflers are more free flowing than the stock mufflers (more of a straight through design) and thus allows more efficient flow which equals a nominal gain in HP/TQ that I could honestly feel, especially at higher RPMS. Link to comment Share on other sites More sharing options...
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