Apex stretch complete!

PowderFalcon

Pinnin' it!
Joined
Jan 29, 2007
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Location
Drumbo, ON
Country
Canada
Snowmobile
2021 Sidewinder SRX
Finished my stretch kit install! Thought I would share the finished product! 121-144" stretch with 1.75" back country track. Skid and tunnel extensions from muffin works. Quite the project but very happy with the results. Finally able to get the power to the snow! Thanks to muffin works and Allen ulmer for their help.
 

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Looks great, can you list out all the parts & manufacturers, would be great to see & determine if its cost prohibitive. How has the handling changed before/after?
 
Parts and manufacturers are pretty much laid out in my original post. Pretty simple actually. The muffin works rail extensions fit bang on. The tunnel extension (also muffin works) took a bit of modification. I was told from the boys there that my model (07 GT) has a bit different setup from how their kit usually lines up. Figured it out though and the finished product looks clean and is very solid. Other than that, i put on the 144x1.75" camoplast back country track with a new set of duponts and I was off to the races!

Handling surprised me to be honest. I thought with the paddle design that it would be a bit harder to steer and want to keep going straight all the time, but with a slight transfer adjustment, it handles great! Having said that, the rail extension kit is the tip up version and I'm also running pilot skis, so that helps also.
 
Finished my stretch kit install! Thought I would share the finished product! 121-144" stretch with 1.75" back country track. Skid and tunnel extensions from muffin works. Quite the project but very happy with the results. Finally able to get the power to the snow! Thanks to muffin works and Allen ulmer for their help.
Looks awesome man,! Good job
 
did exact same mod it is awsome differance(muffin works gear was super i also had to touch tunnel ext with a grinder here and there only poss things to report ''''''' superb in the fluff dont seem to have problem with approach angle ........I would like softer clutch engagement for off trail ......i have been told i need to buy pink blue pink spring from 09 model( mines an 07) and i will have softer engagement and at lower revs feed back on that any one
 
That's interesting about the spring, I'll have to look into that!
Very happy with the hook up now! With extra boost, I was just spinning. Now she launches out of the hole! Totally recommend this mod to any 121 owner who wants more power to the snow! Scrubs a bit of top end, but corner to corner, bush to bush, and field to field, it just plain hooks up like crazy!
All said and done with extensions, duponts, and track, it was appox $1000 US upgrade. But I got $500 for my 121 cobra track, so call it a $500 upgrade! Worth every penny!
 


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