• Pro Circuit

Pro Circuit T-4 4-Stroke Exhaust System w/Headpipe - 4QH04450

  • Part #: 431824
  • Manufacturer Part #: 4QH04450
  • MSRP Price: $574.95
  • Our Price: $517.46 *
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Overview of Pro Circuit T-4 4-Stroke Exhaust System w/Headpipe - 4QH04450

  • Designed to boost output throughout the powerband
  • Fine-tune your power delivery by changing end caps
  • Lighter than stock
  • Extruded 6061 aluminum silencer resists oxidation and features long-lasting packing material
  • Quick access to the U.S. Forest Service approved screen spark arrester through removable end cap tip
  • System includes connector pipe and headpipe


Specs

Type Complete System w/Spark Arrestor
Units Each
Weight 8.37 lbs

Specs for Pro Circuit T-4 4-Stroke Exhaust System w/Headpipe - 4QH04450

Type Complete System w/Spark Arrestor
Units Each
Weight 8.37 lbs

Fitment for Pro Circuit T-4 4-Stroke Exhaust System w/Headpipe - 4QH04450

Part 431824 fits the following machines

See if this part fits your ride

Honda
2005 Honda TRX450R Sportrax
2004 Honda TRX450R Sportrax

Reviews for Pro Circuit T-4 4-Stroke Exhaust System w/Headpipe - 4QH04450

out of 8 reviews.

8 out of 8 (100%) customers would recommend this to a friend.

5 Stars
7
4 Stars
1
3 Stars
0
2 Stars
0
1 Stars
0
Fitment:
Sound: Very Loud
soft loud
Finish:
Performance:
Write a Review

excellent exhaust

December 25, 2013

I purchased this exhaust system a week ago, and I must say it's the best! I put this on my 2005 crf150f and the increase in horsepower and throttle response is 10x better! On a side note I did have to pry apart the rear mounting bracket a little bit. And also the pipe sounds really great......it's like night and day compared to the stock pipe......it's also much louder by at least 60% I don't think my neighbors like the sound haha.....bottom line get this for horsepower and throttle an sound increase you won't be disappointed!

I would recommend this item to a friend.
Fitment:
Sound: Very Loud
soft loud
Finish:
Performance:
the PC pipe sorry for bad quality! sounds better in person!
Images for this Review:
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By: from Beaumont Tx

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PC Exhaust

February 11, 2013

It gave my KLX nice sound, quicker throttle response and better performance across the powerband. I dont think you can go wrong with Pro Circuit products.

I would recommend this item to a friend.
Fitment:
Sound: Loud
soft loud
Finish:
Performance:
By:

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2005 CRF 230F

July 5, 2012

This PC exhaust system is worth every penny. Sound & quality is beautiful. The sound is quiet thru loud depending if you are using the quiet insert that is supplied. The reason why I gave fitment 4 stars is because I had to pry the welded brackets on the muffler wider to go over the rubber grommets on the back subframe where the long bolt goes through.

I would recommend this item to a friend.
Fitment:
Sound: Loud
soft loud
Finish:
Performance:
By: from Salem, OH

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Pro Circuit T-4 exhaust

June 3, 2012

Put this on a 2002 TTR 125. When the exhaust arrived I was a little nervous because it came in 2 pieces, the muffler and the exhaust pipe. I thought I would have to make some alterations to the mounting to get it to fit. But it mounted perfectly without any modifications to the mounting brackets. This system was added for extra airflow after we "swiss cheesed" the airbox and rejetted. Sounds real throaty and makes the 125 sound like its got some muscle. Also, it is noticeably lighter than the stock pipe. Kind of pricey, but our options were limited for the TTR and we needed more airflow thru the motor.

I would recommend this item to a friend.
Fitment:
Finish:
Performance:
By: from Buffalo, MN

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excellent exhaust

January 9, 2012

Fits great Sounds even better highly recommend this system

I would recommend this item to a friend.
Fitment:
Sound: Loud
soft loud
Finish:
Performance:
By:

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Great pipe, lots of power

June 22, 2011

Bought this for a 2006 crf230f and it definitely increased power and has a great sound.

I would recommend this item to a friend.
Fitment:
Finish:
Performance:
By: from Blanchard, Oklahoma

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Great Performance Boost

August 31, 2010

I bought this pipe to increase performance as the stock exhaust was very restrictive. The new pipe bolted up easily to the machine, but was resting on the pull start handle. This was a problem that I needed to correct. I ended up having to heat up the pipe and bend it so it would not touch the handle. This did not go smoothly... For the money this kit cost, fitment should have been better. I also installed a jet kit at the same time which has the machine running perfect. Overall I am very pleased with the performance increase and construction quality of the kit.

I would recommend this item to a friend.
Fitment:
Sound: Very Loud
soft loud
Finish:
Performance:
By:

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Great exhaust for racing

September 29, 2009

It sounds and looks awesome. The only problem is it is so darn loud. Fit was perfect but it touched the clutch cable on my Z50 and I need to make a bracket to hold the cable off the header.

I would recommend this item to a friend.
Fitment:
Sound: Very Loud
soft loud
Finish:
Performance:
By: from Virginia

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Instructions and Media for Pro Circuit T-4 4-Stroke Exhaust System w/Headpipe - 4QH04450

Instructions - PDF Instructions - PDF Instructional PDF