there are gains from the gears thats why I said you would have to remove them. Fuel is VP MS109 which was never tested and may or may not pass the SCCA test. I don't think b&b is worth much either just some mice nuts hp if you're looking for every last one. But in my case a b&b would replace rings and other worn parts in an old engine. But if I was looking for every hp I'd start with a new engine not one with as many track miles on it as mine had.

I've hear numbers ~3-5k+ for the header and exhaust. never confirmed that.