I have a 2004 Wolvey that I'm about to put 25" tires on. I want to keep the stock muffler on due to noise concerns but would like to get a bit more power. I'm considering getting a K&N filter, adding some 1" holes in the air box and possibly re-jetting. Has anyone done this? I know that a pipe would help, but like I said I want to keep it stock quiet. What do you guys think?
Thanks!

 

you can just get an endcap for your exhaust that'll keep you in epa standards...

 

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Even the end cap will increase the noise so if you only want a little more power to turn the more agressive wheels put on a k&N air filter and jets. This will give you the extra bottem end and will keep the top almost the same.

 

Thanks! It's the bottom end that I don't want to lose after increasing the tire size.