Pro Circuit T-4 GP Complete Exhaust

$749.99 - $779.99
$674.99 - $701.99
5.00 5 4
5.00 out of 5 stars
Pro Circuit T-4 GP Complete Exhaust
Pro Circuit T-4 GP Complete Exhaust
  • Description
  • Reviews (4)
  • Q&A (7)
  • Fitment

The T-4 GP System is a tunable version of Pro Circuit's more exotic Ti-4R System and includes the all new, sound-reducing RC-4 Resonance Chamber. Pro Circuit developed T-4 GP Complete Exhaust System with the intention of satisfying your motorcycle's thirst for more power at a reasonable cost. It will boost your bike's overall power by not only adding raw performance but will also add power by shaving weight. The durability of the T-4 GP is beefed up by using stainless steel for the head and mid pipe. Pro Circuit stepped up the performance of the T-4 GP, making it tunable by including both spark arrestor and race tip so you can choose your end cap to match your riding conditions.

  • Lightweight 6061 T-6 aluminum sleeve.
  • The T-4 GP complete system lowers and centralizes the motorcycle's center of gravity for improved handling and performance.
  • Each model is rigorously track and dyno tested to produce maximum performance and usability.
  • A removable U.S.F.S.-approved spark arrestor and race tip are included with every exhaust.
  • Maintenance on the T-4 GP exhaust is simple with the bolt-on removable end cap.
  • RC-4 Resonance Chamber to reduce noise.
  • Billet aluminum mounting bracket.
  • Meets AMA sound requirements.
  • Note: The RC-4 Resonance Chamber, depending on year of your bike, might not be included with the system.

The T-4 GP exhaust gives you the ability to take your dirt bike off the track to the unbeaten path with the U.S.F.S.-approved spark arrestor but, when you are on the track using the race tip, the T-4 will meet all AMA and FIM sound restrictions.

5.0 out of 5 stars (4)
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1-4 of 4
Overall 5 out of 5 stars
Verified Purchaser
Location: Valley Of The Sun, Phoenix, AZ 85006, USA
2007 KX450F

Changed the power delivery and the bike feels great. Way more aggressive than your stock exhaust. Pricey upgrade but worth it

Overall 5 out of 5 stars
Best out there

i bought this exhaust for my 09 kx250f, it was my far the best exhaust i have got for any of my bikes. it sounds great and added power to all rages of the throttle

Overall 5 out of 5 stars
Location: Coral Springs, FL
Awesome Product

The install was so easy, they give you everything you need. I love the look and sound of it. The performance is so noticable. Great exhaust!!!

Overall 5 out of 5 stars
Location: Cheyenne, WY
Must buy

This pipe is awsome!!!! My stock header was melting one of my hoses and this one doesnt even come close to touching it!!!! I ride an 07 kx450f and that gave it plenty of power all the way around!!!! I wish i had more of a choice with different end tips and silencers. If you are you lookin for a good pipe right here it is!!! Sounds awsome to!!!!

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Total Questions (7)
Questions with answers:
Questions without answers:
dave123 Location: santa barbara
T-4 vs.
1-7 of 7
dave123 2 years 9 months ago Location: santa barbara
I ruined my ti pro circuit silencer and mid pipe in a crash and still have a good ti head pipe. can I order just the stainless silencer and mid pipe from you? and will it fit on my ti head pipe? Thanks Dave Phreaner ps its for my 09 crf 450R
MotoSport Staff
2 years 8 months ago Location: Portland, OR, USA
Unfortunately the slip on exhaust we sell is designed to work with the stock header and not the Pro Circuit head pipe. To obtain the correct replacement muffler you will have to contact Pro Circuit directly.
LOWElife Over 5 years ago
will this fit a 2010 wr250f?
MotoSport Staff Expert
Over 5 years ago
i dont actually carry it for your bike. i only carry the pro circuit slip on.
LOWElife Over 6 years ago
would this exhaust system fit on a 2009 wr250f?
Top 1000 Contributor
Over 6 years ago
No it will not.
bwood577 Over 6 years ago
T-4 vs. ti-4?
just want to know what the main difference is in the ti-4 complete exahust and the t-4 complete. is the ti-4 really worth the extra money or is the t-4 just as good?
MotoSport Staff
Over 6 years ago Location: P+RTLAND
Both pipes are identical as far as performance and construction goes. The only difference is that the TI-4 is going to be titanium and is a little lighter than the T-4 which is a stainless exhaust. If all you do is strictly track riding I would use the TI-4 if you do track and trails I would stick to the T-4
Biff Over 6 years ago Location: Austin, TX
Buying separate or together?
What is the difference in buy the system separately ( header and can) or complete system?
Expert MotoSport Staff
Over 6 years ago Location: Portland, OR
With this particular system you will get a different style head pipe that is not sold individually. It only works with the Pro Circuit GP Complete system. You gain more bottom end performance with this exhaust.
alpha Over 6 years ago
how many db is this pipe with no silencer insert or spark arrestor?
MotoSport Staff Expert
Over 6 years ago Location: Portland, OR
according to Pro Circuit that would be 94db
austinm Over 6 years ago Location: colorado
Is the 98db sound good for the new ama sound regulation?
i saw that this exhaust says 98db and was wondering if this was ok to race ama with because i thought the regulation was 98db?
MotoSport Staff
Over 6 years ago Location: Por+land
The AMA sound specs should be either 98db's or below so yes, this exhaust is ok to run in AMA races.
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