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Mine isn't too bad at all. The 6637 filter helps a lot. So does the right exhaust modifications. I never bothered to quantify it, but I would describe it as "very mild".
Knowledge is power, being stupid or a idiot is no excuse. Six years ago I used a torch, I didn't know any better. No one on this site said or gave any warnings like Ian does. Where were you Ian when I attempted to burn my truck down? Obviousy I got lucky! LOL
I don't know why that would seem like a good idea to someone. There's oily parts all over the place around there, and I'd be worried about getting slag all over somewhere that it shouldn't be. I mean, if you did it and it worked, more power to you. I just don't have enough confidence in the precision of my torch cutting ability.