Exhaust system

by **Ski 670 DOO** » January 10th, 2002, 12:09 pm

What is the best aftermarket exhaust and clutch system made for the 97 670 ski doo MXZ?

by **swissbliss** » January 10th, 2002, 10:43 pm

I HAVE FAST TWIN FAST PIPES,A PARQUETTE CLUTCH KIT,2 TEETH DOWN ON THE TOP GEAR,SHORTY CARB BOOTS,THICKER BASE GASKET,THEN HEAD SHAVED,ROTORY VALVE KIT,EXAUST VALVE ADJUSTER,AND MY 97 670 SMOKES MY BUDDIES 98 670.

by **michahicks** » January 10th, 2002, 11:37 pm

Good God man, with the money you spent on that 670
to beat your buddies 670,why didn't you just go out and buy an 800?
Al

by **swissbliss** » January 11th, 2002, 12:19 am

IT WAS JUST A PROJECT I PLAYED WITH ,I GET A NEW MXZX 440 FOR SNOWCROSS EVERY YEAR.THE 670 IS JUST A PLAY AROUND LAKE/TRAIL SLED. IT ALSO HAS OTHER GOODIES ON IT LIKE A CLEAR HOOD, USI SKIS CUSTOM PAINTED TUNNEL AND SOME OTHER STUFF.THE SLED LOOKS GOOD ,IT TURNS HEADS WHERE EVER I GO!

by **straycat** » January 11th, 2002, 1:06 am

swiss,
I don't blame you. I have a zr580 like that. I like taking it out and running it with the 600's and 700's. It is cool to tell them that it is just a little 580. when I can keep up with them till 110 mph! plus its very light and easy to ride! I can ussualy catch and pass the big bores threw the woods and over the ditches.

by **MXZinger** » January 11th, 2002, 4:32 am

Swiss bliss, You got a cool little project there. How much $ you have in it? 670's are sweet because they are light as hell for the trails and can still rock on the lakes.

by **swissbliss** » January 11th, 2002, 5:38 am

I LOST COUNT OF HOW MUCH I PUT INTO IT BECAUSE I DID IT OVER A PERIOD OF A COUPLE YEARS OR SO,BUT IT HAS TO BE CLOSE TO A COUPLE GRAND.AND YES THE 670 MOTORS KICK BUTT , MINE SOUNDS SWEET WITH THE DUAL PIPES SCREAMING ACROSS THE LAKE.

by **Ski 670 DOO** » January 19th, 2002, 12:58 am

Is there anywhere else i can get information on these twin pipes that anyone else knows about. Thanks

by **swissbliss** » January 19th, 2002, 2:48 am

AAEN PERFORMANCE MAKES TWIN PIPES FOR YOUR 670
1-414-552-8981
OR CRANK SHOP
1-802-878-3615
FAST DONT MAKE PIPES FOR THE 670 ANYMORE
I WOUND UP GETTING ONE OF THE LAST SETS
PSI ALSO MAKES A SINGLE PIPE THAT WORKS PRETTY GOOD!!!!!!!

by **thekrust** » January 20th, 2002, 7:50 pm

I've done quite a bit of work on the 670, including dyno testing several sets of pipes. The only pipe that ever gave consistant hp increase were the Crank Shop units. The other thing to remember is that Ski-doo builds a very good factory pipe and the best gains are only 3-5hp and near 9lbs of wieght. The other option is to but a B&B eliminator pipe on, that'll save you about 8lbs, and sounds almost as good as twin pipes.
If you want to make it go, I would cut the head down put a 501 spec carbon fibre rotary valve and bore those 40mm carbs (can safely take them to 43mm). I also used a .040 shim under the cylinders, big difference

*This Message was edited on 21-Jan-02 12:53 AM by thekrust*