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i will say i can tell a difference with power my back end is losing traction a lot more then it used too might install some bmc filters see what that adds
By no means am I jacking here... but I wanted to chime in considering the aforementioned price points (and this is simply a "if you didn't know... here's a friendly FYI").
We have an exhaust suite with two killer options, for a fraction of the cost, which would allow your unspent funds to be dispersed to other areas of your 63 (or just remain in your wallet).
We have our SwitchPath™ Exhaust equipped on our own Edition One, which enables us to retain the factory exhaust valve button... but we also have a kit that enables non-Dynamic Performance Exhaust-equipped vehicles to be valved, and to have complete control of said valves as well via our SwitchPath™ Remote
If you're looking to have a rowdy soundtrack all the time, our Track Edition system will provide it (retains valved H-pipe, same engineering as the SwitchPath™ Exhaust, minus the SwitchPath™ resonators in the rear). This version is equivalent to the SwitchPath™ Exhaust with its valves open.
See below for visual reference, and click the images to be taken to the product page (where you can see our machined exhaust tips, too, among other things):
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
