Pro Circuit T4 Exhaust

2 replies to this topic
  • Airastro

Posted April 16, 2000 - 08:39 AM


Has anyone tried the new Pro Circuit T4 exhaust system. I am trying to decide between the Pro Circuit, DSP (Yoshimura)and the Big Gun. I ride mainly the local Motocross/Supercross tracks in So Ca. Any Response would be welcomed. Thank You

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • holeshot

Posted April 17, 2000 - 11:03 AM


I put the T4 exhaust on my 426 three weeks ago because it had a removable (takes three minutes) cone-type screen spark arrestor. The pipe is a three piece unit and fits perfectly.
Yes, it is louder than stock, even with the screen in and it makes a bit more power and also seems to allow the engine to rev further. The core is 2" in diameter (much larger than stock) and Pro-Circuit says that a quiet core may be available soon.
I only run the bike half throttle anyway, so I didn't need more power and possibly someone who can actually use the power would be better suited to evaluate the output.
It seems to start easier, but that may be because I'm getting used to the four stroke.

  • holeshot

Posted April 25, 2000 - 10:29 AM


Actually, there was a clearance problem with the T4 exhaust and radiator which I've posted about on the DRN board...

Related Content


yz400f throttle bog by yz400fmaniac

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • * * * * *
  • Hot  28 replies

YZ450F 03 Sparks driving me crazy by SirAttard

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 replies

Help with 2000 yz426 by weekend woods racer

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  36 replies

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F

Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies

Michigan Motocross Tires by 288yz450

Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.