Re: mufflers
I used a self tapping sheet metal screw. I screwed them directly into the collector. I ran them a couple of races. I needed to move up on the sheet at a race and took them off I picked up .08 from previous pass.
These mufflers are cheap. I bought them from Speedway Motorsports, Around $50 for the pair. If car is tuned properly probably won't be any difference.
Chip
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