Yea, an exhaust would help some but would require that I either drop the axle or cut off the original pipes. Not gonna do either, besides, my straight pipe for my cat has a cut out. It's hard to believe but original TTA exhaust tips go for big $ on eBay. No one makes duplicates so the only place to find any is from someone who's removed their original system and cut off their tips. I like the look of the twin stainless tips from each side.
I can put my car back to 100% original in a days work and want to keep it like that.
There's a guy not too far from me who runs 12.5-12.6's with full original exhaust minus the cat, and that's with the factory restrictive down pipe. All he's done is fuel pump, regulator, chip, open air filter and tires. The guy's a tuning madman.
Here's video clips from his runs:
http://www.krif.com/tta/Movies/GLENN...%20RUN%201.MPG
http://www.krif.com/tta/Movies/GLENN...%20RUN%202.MPG
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Here's another video clip with an even faster time from that Mustang:
http://www.theclashofthetitans.com/i...eos/vids/9.mpg