Exhaust Mod !

First of all let me say Thank You to Onebuilder for reminding me of this mod ! Thanks Steve !

For the 660 and I guess the 700 also, there is a huge weld inside the header pipe on the exhaust. This weld restricts the air flow, thus restricting power. The welds purpose is to hold the flange on the end of the header pipe. On mine I would guess this weld to be about an eighth of an inch. To help flow air You can grind this weld down. Some people ground it completely flat and then put a weld on the other end of the flange on the outside. Others, like myself, ground it down to almost flat and then round it off and polish. The results I have seen so far have been a touch more initial low end response and even more response in the mid throttle. This along with an exhaust tip, greatly improves the exhaust end of the Rhino. I feel like I am as close to and aftermarket exhaust as I can be without the noise.

Factory welds.......





After grinding........





I would suggest a die grinder and a metal bur wheel for grinding........

yea man made a nice difference on mine also , good low even better mid range, cant beat it for the money, none unless you replace donut gaskets, I did

what was the lug wrench for pipe removal

im probably gonna do this to mine but my question is do i need to rejet? stock air box and filter now also. Also if i do the tip with this will i need to rejet?

wo, n't know until you do it , mine was a little rich to begin with, you should most likely be ok but may things depend, temp ,elevation, just have to do a plug reading and see

should be ok

Free horse power can't beat that!

I did mine and so far I likey likey!

love it , its like a sore dick, you cant beat it

yea it looks like that would let it flow better