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I haven't heard the 2011's w/an off-road x yet. But I have only the o/r x with flowmasters that came on the car and yes... Its very raspy and annoying. I couldn't tell a difference in tq loss. I'd and get a programmer also. Just my .02

As you may have noticed I am brand new to this site. Been searching and finding useful information for awhile here, and finally decided to join in! I have a 2005 GT running a few bolt-ons including: Pypes o/r x Flowmaster axlebacks ( These were already installed before buying the car...

GT

Smoky Mountains

Deals Gap, AKA Tail of the Dragon, NC

American muscle offered a free tunes for life when I bought mine. Is definitely worth it if our slow about adding extra parts. As far as noticeable power adder alone? I don't personally think it gives much performance gain (5hp?). BUT, on the other hand if you intend to install extra parts...

Never had issues with mine either.... Want to think it could be installation error for the causes of most people's problems.