As above I drilled 4 holes (2each side)
Throttle response struggling a little if I blip it a little very quickly, what can I do to resolve?

More air = more fuel needed.

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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

Thanks Kev! I get that but how should I go about it and thanks for reply on stickers I never got to reply apologies. If I had to choose, would a aftermarket filter, a side box cover filter or your fuel/air mod be the way to go, or aftermarket cans?

Appreciate the help I'm a newbie

Im not Kev..but yes...more air in through the sides,snorkle out and stage 1+2 DNA airfilters(flow more air than k+n).
Stage 1 is replacing standard filter.
Stage 2 is the replacement of the air box side panel with a complete air filter.
Free er flowing zorst..I have Arrow can's,fecking awesome sound.
Both Kev's mod's. No power gains but makes the bike soo responsive and arguably how it should have left the factory.
Kev's throttle mod.

Enjoy!!

I'm probably wrong but I think, possibly;-

Stage one is changing the paper filter for a free breathing version.

Stage two is the removal of the air filter snorkel in lieu of an open top filter cap

Stage three is the removal of the air box side panel and replacing it with an air filter.

They all increase cooler air draw and 1+2+3, by definition, would require the most additional fuel to air mix.

There's nothing nicer than hearing that 'induction roar' but I would respectfully suggest riding a bike with uncorrected fueling, especially prolonged use in the upper rev range, could cause significant damage to the piston crown or valve seats. (you have now effectively leaned out your air fuel ratio)

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Thanks for response guys, I'm new to the xt not new to bikes so I know how they work and I do my own work but back to my original question re having drilled the box, for now what can I do to improve throttle response and balance the mix with the additional holes.
Thanks again