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Pro Circuit T-4 Head Pipe Stainless

Retail: $199.99 - $324.99
$179.99 - $299.99
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Pro Circuit T-4 Head Pipe Stainless - Main
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Product Description

The hand-built stainless steel Head Pipe allows for one of the finest bolt-on modifications that you can add to your motorcycle or ATV. The unique design will enhance low to mid RPM power, making it the perfect choice for upgrading your stock system.

  • Built using 304 stainless steel designed for maximum durability, corrosion resistance and style.
  • Replaces stock head pipe.
  • Will fit the O.E.M. or Pro Circuit Slip-On.
  • Customer Reviews
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(20)
4.8 out of 5 stars
5 star   17
4 star   1
3 star   2
2 star 0
1 star 0
Write a Review
“ got this header and it bolts right up to the stock muffler on the 2003 crf450r and looks good it also... ”
codythecrf450rrider Location: Calhoun,TN
“ i purchased this header to hook it up with an hmf slip on. ”
shastajim Location: Round Mountain,CA
“ Sweet look and sound. ”
Smitty53Fly Location: J-Vegas, NC
1-10 of 20
Overall
Top 50 Contributor
Location: Albany,NY
Excellent product over stock
Bought this for my 400ex to go with my pro circuit slip on. Much better header than stock on a honda, but anything is better than stock. A bit more bottom end i feel. Worth the price.
Overall
Location: Calhoun,TN
GREAT HEADER
got this header and it bolts right up to the stock muffler on the 2003 crf450r and looks good it also added more power from low to high range rpms
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Location: Round Mountain,CA
Better know what your doing
i purchased this header to hook it up with an hmf slip on.well the collector on the header is the same diamater pipe as the slip on yoke of the muffler.i ended up cutting the pipe off on the muffler & welded one on that would slide over the collector on the header.really should let customers know the diameter of the collector in the advertisement.
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Top 250 Contributor
Location: Warren. ME
Head pipe
I bought the T-4 slip on and decided id buy this too, its comes in 3 peices and has springs to hold them together, and it doesnt stay tight with the motor..also doesnt fit very good with the slip on
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Location: Seattle, Wa
This product is worth it
I have a 08 raptor 350 and I decided to change some stuff on it. If you get a Pro Circuit Exhaust you gotta get the Pro circuit header also. I bought an Air filter also. But the bad part is when you buy the jet it and follow the directions, They're not really right. My quad after the jet kit was installed would not what start what so ever, So we had to take it in and have go trig the Carb. I can defiantly tell the difference in performance and sound
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Location: gypsum,co
Kx450f 09 no inprove of power but satisfaid if pip
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Location: J-Vegas, NC
Nice Increase
Sweet look and sound.. noticeable power increase throughout the power band.
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Ease of Installation
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Style
Top 250 Contributor
Location: Santa Barbara CA
Very happy with the header. Perfect fit with the pipe.
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Top 500 Contributor
Location: Fillmore, CA
Nice Addition
Finally had this header installed on my Z400 with a slip on pro circuit and was amazed with the results. Not only does it add a deeper tone, the power is much more broader. Felt a lot more in the bottom to mid and top. Also makes my bike look way better. Overall very impressed with it.
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Top 50 Contributor
Location: Pendleton, KY
Great Pipe
I bought this to replace my 09 kx450 stocker since it dented and creased. It was easy to install and has a mild gain over stock performance.
1-10 of 20
Total Questions (32)
Questions with answers:
  32
Questions without answers:
0
Have a question?
“ Is this head pipe a straight through flow or restricted and would i be able to put straight pipe exha... ”
kdub Location: Paige, TX 78659, USA
“ Does it come with all the hardware?... ”
drepola
“ Will this fit a07 arctic cat 400 4wd with susuki motor?... ”
Hopper08
1-10 of 32
kdub 21 days ago Location: Paige, TX 78659, USA
Is this head pipe a straight through flow or restricted and would i be able to put straight pipe exhaust on it, if so what diameter pipe can i use??
Can I run straight pipe exhaust with out losing any back pressure or horsepower??
MotoSport Staff
12 days ago Location: Portland, OR, USA
This header is is a replacement header from Pro Circuit for thier full system exhaust. It is not designed to work with any other exhaust system. Unless your motor is built to run an open exhaust you will lose horsepower.
Answer this Question
drepola 1 month 8 days ago
Does it come with all the hardware?
MotoSport Staff
1 month 7 days ago Location: Portland, OR, USA
The header pipe doesn't necessarily come with any hardware since there isn't much needed to install. It will reuse the stock hardware when attaching to the cylinder.
Answer this Question
Hopper08 2 months 2 days ago
Will this fit a07 arctic cat 400 4wd with susuki motor?
MotoSport Staff
1 month 29 days ago Location: Portland, OR, USA
No, unfortunately this will not fit any Arctic Cat applications.
Answer this Question
m070z17 Over 3 years ago
If i have an existing t4 slip-on exhaust, will the t4 stainless header line up like the oem titanium one does?
MotoSport Staff
Over 3 years ago Location: Tualatin
yes the t-4 head pipe will slip right on to your t-4 muffler
Answer this Question
660brian Over 3 years ago
Will it fit a 04 raptor 660 with fmf powercor 4 slipon?
Expert MotoSport Staff
Over 3 years ago
no
Answer this Question
harry788 Over 3 years ago
Will the header pipe fit a standard wr250f exhaust?
Top 250 Contributor
Over 3 years ago Location: Arlington, WA
they are made to fit stock or aftermarket slip ons
Answer this Question
jjhunt Over 3 years ago
Hmmm?
ok iv been reading all the q and a on this head pipe i hav an 04 dvx 400 if this pipe is made like the oe head pipe and is the same diameter as the oe pipe how is it supposed to help in power and torque
MotoSport Staff
Over 3 years ago Location: P+RTLAND
It may be the same as far as the OE head pipe diameter is concerned, but the bend of the pipe is a little different so that's where the power gains come from.
Top 250 Contributor
Over 3 years ago Location: Arlington, WA
stainless dissipates heat better and also gives you less carbon build up. better flow..better hp
Answer this Question
bradc622 Over 3 years ago
Will i need to rejet my bike if all i purchase is the header?
Over 3 years ago Location: wooster ohio
if it is a different size from the one you have on there now you will have to rejet it
Top 250 Contributor
Over 3 years ago Location: Arlington, WA
re jet after all exhaust mods. especially when u do an air filter as well. you will notice a difference
Answer this Question
intensequader Over 3 years ago
I have a LT z250 and i have a yoshi slip on it and this header isnt fitting. what should i do?
MotoSport Staff
Over 3 years ago Location: P+RTLAND
Not too sure what you can do, if you bought the header through us and still have all the original packaging and the exhaust is in brand new condition we can set you up with a return, but that's about it. It's always iffy mixing up exhaust manufactures since they all do things a little differently.
Top 250 Contributor
Over 3 years ago Location: Arlington, WA
get a yoshi header and not a pro circuit one
Answer this Question
LJ257 Over 3 years ago
What silencers is it compatable with?
I've got an 03 CRF450R I bought a new Ti4 Pro Circuit slip on for after i blew out my other one, after every race the slip on slides apart from my stock header. So will this T4 header fit to the Ti4 slip on I have and keep a seal under hard racing conditions, or do I need to get a straight up Ti4 header?
Top 1000 Contributor
Over 3 years ago Location: old forge pa
I asked procircuit themselves and they said if it fits the stock header it will fit this one
Answer this Question
1-10 of 32

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