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how does a tuner effect the cat?

don't want slip ons.. am happy with things as they are minus the heat thrown from the exhaust. have little over 6300 miles on it since i got it and when i'm in 40 f or less i can actually warm my hand up by holding it over the exhaust behind my leg. i figure it's got to be really warm for my passenger... and i want to her happy. so i am wanting to get rid of the heat for summer if i can.. i live in the sticks so stop and go traffic isn't a factor. would just getting a tfi and trying it with stock config actually work against what i'm trying to do?
 
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