Ordering pro circuit T4 slipon tomorrow unless anyone says something...

[DareDevilQracer]

Im getting it for throtle response, power, and not having to re jet.

[DareDevilQracer]

And without re-jetting should i run it without the airbox lid?

[TheX1992]

you maaaaaaaaaay have to think about rejetting...the guys at the dealership make it run perfect STOCK not w/ slipon pipes and no airbox cover.
"thou change 1 thing, thou shall change thy rest"

[Pappy]

get the pipe....but you will have to check your jetting.

thou shalt re-jet or thou may melt thy piston!

[Leo]

I loved my T4 slipon...

Trying to run it without the airbox lid on stock jetting is not the way to go.. Your going to be seriously lean..

Leo

[brian400ex]

My bike is stock except for the slip on. I called Pro Curcuit up and they said no jetting will be needed, but i went ahead and put a 158 main jet in there just in case.

[BIGRED400]

20 pipes tested with re-jet, Curtis Sparks winner 2nd place goes to White Bro.s E-Series with only .2 of a hp behind 2/10 of 1 hp this was all done with a dyno . Go to atvnews.com then project quads then pipe shootout.......pretty impressive and the ones you think are good are"nt really

2002 400ex
2002 250 ex

[DEAL]

haha Dg and Big gun produce the same amount of power.

[Foxrage]

I would rejet take airbox lid off and get a K&N filter then you will notice even more power and better throttle responce.