Question on exhaust and jetting

[bluesnowmonkey]

Ok guys, I need some advice here. Let me outline my situation first. I bought a bike (YZF-600R) with a D&D pipe and K&N jet kit. Well that pipe is loud as all hell. I'm not kidding, you have to hear one of these to understand; it was a little painful initially just cruising around town. The stock pipe was thrown in, and I wanted to put that on to quiet it down. I'm fairly ignorant with these things, but I understand that the jets are tuned to a certain amount of back pressure from the exhaust. So if you change the exhaust, it changes the air/fuel mixture, making the engine run rich or lean. Now what are my options?

1. Put on the stock pipe. Actually, I just did this to hear it. It's practically silent. Me likey. So what if it's not quite as safe, because there was about a 100% chance that I was going deaf -- a poor tradeoff, to my mind. I haven't had a chance to drive it around, because the procedure involved a stuck bolt, unsticking of which required a couple of beers. But perhaps that's for the better; is it even safe to drive with a mismatched exhaust? Will it damage the engine? Will it get lower fuel mileage? If there would be any such problems, what if I had it jetted for the stock pipe? How difficult/expensive would that be? Can I do this myself? Are any parts even required, since it should already have adjustable needles?

2. Repack the D&D. A friend (fairly knowledgable with bikes and working on them) suggested that it probably just needed to be drilled and repacked, and offered to do this for me. (Well, he didn't offer exactly; my point is it's not like he was trying to push something on me I didn't need.) He may never have heard this brand before, though, and not knowing that it's basically a straight pipe to begin with, won't dampen the sound as much as he thinks. Or maybe he'll repack it in a way that affects airflow, leading to the same issues and questions as option #1.

So that's it. What should I do here to shut this wailing bitch up? Is there an option 3?

[93FZR1K]

All D&D pipes I've ever heard have been extremly loud. Repacking may not make a difference. And your listening to too many Harley riders Loud pipes do not save lives it lets the police find you and annoys the SH!@ out of most people other riders included.

[pmoney]

Originally Posted by 93FZR1K

All D&D pipes I've ever heard have been extremly loud. Repacking may not make a difference. And your listening to too many Harley riders Loud pipes do not save lives it lets the police find you and annoys the SH!@ out of most people other riders included.

well said!!!!

[robbieace]

buy new pipe not d&d

[dennisred69]

If im not mistaking you can jet a stock bike you just have to adjust the carbs for it.