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DP muffler, both exhaust openings enlarged, and what Treeslingr' calls a "mild port job". It's not a real hotrod but it will smoke a stock 660 by a wide margin. Mostly it just runs cooler and easier than a stock 660.

And louder. That way the boss always knows when you're working. ;)

Ya, it looked to be cutting nicely.

I am gonna have to get in mine and do alittle "Dowerizing" haha.
just alittle out of the intake & exaust ports with a bumped comp ratio really perked my 372 up, hopefully the 660 will have the same disposition..
 
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