Pro circuit T-4 vsT-4R?

A friend order a full system exhaust for his 450X. the can he got says T-4R. I checked the PC webpage but there is not much info in there. I noticed that for the T4R you can get just the replacement can or mid pipe unlike the T4 where you only can get the headpipe or the can with the mid pipe toghether. Only difference I noticed is that the T4R can and mid pipe have only 1 retaining spring, while the standard T4 uses 2.

So performancewise, whats the difference between the T4 and the T4R? .

I am going thru similar problem, spent big bucks on full Pro Circuit exhaust and rec'd a T-4S, never heard of S (T4S) so I go on website and no info. Call them and guy says I need T-4 GP system to get most performance so I go back to dealership to exchange and long story short, PC doesn't make a T4-GP system for X when I clearly stated I had X. Now I am thinking to get my money back and go with FMF or call MRD. I really liked the way my friends Ti-4 systems felt but somebody needs to get their act together at PC to eliminate the confusion. For the money these exhausts costs there should be clear info on them.

I have decided to keep T-4S w/ SS header. Installed it yesterday with no issues. Apparently PC now has T-4R and T-4S and was told they had no R for my bike, (06X) which I find hard to believe. Supposedly it is lower DB rating but came with extra insert for closed course. Insert gets rid of sparky and maybe bigger inside. I'll report more after riding.

I installed th T4R pipe and mid pipe and a ss head pipe on my friends bike (07). It sounds pretty much like the std T4. I rode the bike a little (After the J&D, cut air box...) and it feels like a bike with a regular T4.

The T4R also had the spark arrestor and th einserto for closed course...

The spark arrestor from the T4R is the same as the one in the T4.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • By cmckay4
      Anyone having or had problems with the starter not turning over easily on the 450X???
      I have read about this problem on CRF's ONLY and not seen anyone come up with a fix.
      Problem being is that you think there is a problem with the battery, when infact the battery is OK. When you have a good fully charged battery in the bike and press the e-start, it turns over very slowly.
      I have checked the electrical circuit and it seems OK. I am wondering if it might be the starter itself - any suggestions?????
    • By Dust_Devil
      I'll start, if you see the "Fox Sticker" out in the Dez you know you crossed paths with ol' DD.....

    • By JohnnyAirtime

      Guys and Gals...
      Post your links to any of your pictures in this thread....
      (proper placement of pictures is in the "picture" threads)
      Post your links to any of your ride reports in this thread....
      (proper placement of your ride reports is relative to the area you live/ride)
      NO TECHNICAL issues, questions or comments in this thread.
      (it'll be deleted to keep this thread clean and with only the above listed).

      Please follow this format;
      Ride Report: Gorman, Tuesday 4-17
      (by Skoot22)
      Pictures from Ride: Baja 4.14.07
      (by Johnnyairtime)
    • By dakynz
      Guys, because of a member ban the jetting database has been removed. Let's start a new one to get this great information created into a sticky for everyone's benefit. Please stick to the information below.
      Temperature Range:
      Smog (AIS):
      Airbox Modified Top:
      Airbox Modified Sides:
      Backfire Screen:
      Air Filter:
      Pilot Jet:
      Main Jet:
      Needle Clip Position:
      Fuel Screw Type:
      Fuel Screw Setting:
      AP Modified:
      Leak Jet:
      AP Cover:
      Exhaust Type:
      Exhaust Modified:
      Pink Wire Modified:
    • By 2can
      I've studied the Jetting sticky's but still have a number of questions:
      I bought my '06 a couple of years ago and had a smog block-off kit installed and the pilot jet was upsized to a 48 and the air box opened up top only. The bike has appeared to run a little lean at times and got hot on a couple of occasions in elevation and on one other occasion. I'm looking at upping the main jet to either a 165 or 170 to help with the possible lean condition. The bike currently has a 142 main jet in it which I believe is the stock size. It looks like the most widely used Needle Jets are the JD Red, but it doesn't look like they are sold separately, is this correct?
      I was going to also get a 45 pilot to have options for further tuning. My assumption is that every bike is a little different and that where you ride is going to have a lot to do with jetting. We ride mostly, mojave desert, baja, and southern Utah with elevations from sea level to 9,000 feet but the higher elevations are generally for a short period as we generally continue through the peaks and head back down.
      I'm looking to convert from a stock exhaust to possibly an FMF Q4. I want something a little throatier but not overly loud and will provide a balanced flow of intake/exhaust.
      So can I get the JD Red Needle Jet by itself or can I get by using the stock and move the clip and be just as happy. I'm just looking to enhance overall performance of the engine and maintain reliability.