Hi Folks,
Been running the kev O2 and fuel mod for 2 weeks now. They've made the bike feel much better. Today installed the dna filters Stage2 (with a stage 3 air flow). The kev mod set just past 6 O'clock. There is a booming type sound coming from the bike , doesn't seem to be the exhaust (stock). Seems to be coming from the airbox. Only noticeable on the move. Is this normal?


Apologies if this has been covered before. This bike carry on is all new to me.

Booming? Like a backfire? Is it not just induction roar that you can now hear due to the box being more open?

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It's not a backfire, it's in sync with the 'throb' of the engine under acceleration. Probably is induction noise as you say. Sounds crap. Ill try the bike with the filter removed and stock cover back on.

Perfectly normal, the bike has a larger set of lungs now and it's breathing louder. You'll forget about it in a couple of days, as it becomes the new "tune" to accompaign your rides Enjoy and relax

Thanks mate.

Blocking off the AIS pipe will reduce the intake noise.

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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 /
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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

I'll do that next , Thanks Kev.

First commute into work this morning with the filters on and noise off the engine during acceleration and engine braking is being amplified by the airbox as its more open. Its got that plastic type booming noise , if that makes sense.

Not sure if I'll get used to it as it sounds unpleasant. Is it possible to line the air box to deaden this sound. Apologies if that's a daft question ;-)

Bike feels great though.

Might seem a daft question, but... Do you wear earplugs when you ride?

If you don't, you should, and a good set designed for specifically for motorcyle will make a big difference to those irritating noises you get when riding, like wind turbulance, induction roar (and whining cam chains for those who ride a triumph! )

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No earplugs at the minute, need to look into it as wind noise is shocking . My head seems to sit in a perfect position to catch wind of top of screen and front of tank.