PSI is just down the road from me in Wild Rose Wisconsin. Id have to tell you PSI works more with Polaris and Arctic Cat. They don't doo a lot with Ski-Doo. They doo offer products, but are not tested to the extent the other brands are. Good Luck with the PSI. I'd look into Dyno-Ports or Crank Shop. But thats just me
I would not try a PSI pipe on that model. The existing pipe set-up if fine.
I usually stay clear of buying sleds that are set-up from PSI. The motor lower ends are usually shot.
I find PSI is a great company to find peak horsepower, but the power band gets real narrow. Now a days It's a real myth that any pipe manufacturer can MAGICALLY increase hp throughout the power range. Truth is there is only so much output an engine can produce. So when you "Bump-up" the peak operating hp, you are actually stealing hp from a lower range.
I have ridden these mxz 7's and they have lots of power everywhere. Bombardier knows this, thats why it's clutched the way it is. You can literally ride in all conditions on the same set-up.
Pipes from the OEM are a comprimise, they offer the best "average" condition. If you are a serious racer, then purchase the appropriate accessories for what you want to acheive and remove the comprimise. If you want a drag sled, forget all about midrange and low end power and buy pipes that spin at 8500+ rpm with an increase in hp in a small area. But remember, you will have a terible day on the trail with this set-up.
Studboy...Is your friend looking at a set of PSI's because he's getting a good deal, or is someone giving the pipes away? Go with Winterfreak's advice, and tell your buddy to give Dynoport a call if he needs to change pipes. I would stick with a single pipe for all around riding. Another great source for tuning advice is Bill Cudney @ Cudneyracing.com. Bill sells an exhaust restrictor for the stock exhaust 3-5 hp..
</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (performancex @ Aug. 01, 2002, 3:32pm)</td></tr><tr><td id="QUOTE">I remember someone saying in a pipes discussion that ski-doo has the best oem pipes[/b][/quote]
I have heard that too. AAEN wasn't able to improve on the single pipe on the old 467 back in the '80s. I think the point was that other than going to twin pipes, it's difficult to get better results than the OEM Rotax single pipe.
I had a PSI single on my 98 MXZ 670 and I thought it was a great improvement over stock. I'm not familiar with the twin blasters though. No matter what, twin pipes are hard to get dialed in for multiple situations. Good Luck!!!
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