Hi is it strictly necessary to fit kevs fuel mod, when de catting the exhaust.
If I do will it drastically afect the mpg, because good mpg was the reason I sold my gsa.
Glad I did lovig the xt
Cheers Ben

I De-Catted mine a year ago and am just getting round to fitting the fuel mod now along with the DNA filter, my plug colour is fine and I gained a little bit more low down flexibility after the De-Cat, not noticed any mpg difference to be honest.
Regards,
Jim.

Firstly welcome to the forum.

The cat will have very little affect on the A/F ratio on these 660's

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Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
[
My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a 2018 MT09SP ABS + TCS

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946

Thanks for the welcom, but you have just done yourself out of a sale!
I will buy the fuel mod when I get around to doing the snorkel and filter.
Cheers Ben

de-catting the pipe improved my MPG! i have de-catted mine and drilled the box open, plus a filter and fuel mod and still get 60 mpg. actually its gone up a bit to 66mpg recently. 35 000 miles on the clock

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Hi I cut the cat out of mine & found a huge differents in performance,
I used to run a single MTC can but found it far to noisy & could not get rid of the
Back firing popping, I have stage 1,2&3 with Kev mod & eliminator, bike runs so
sweet now, smooth no popping & plenty of grunt, really glad I made a decision to remove
the cat as I was finding it hard to gel with the Ten.

Am l reading too much into this or did you just dish Kev on your second post?
Talk like that will not get you far in this world and especially not in a dedicated forum GIVEN to us by VERY DEDICATED Mods.
Careful with your exclamation marks!

I don't think any malice was meant - I didn't read it as such.

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