fmf factory 4 or pro circuit t4 on my 03' yz450f

7 replies to this topic
  • mxracer452

Posted March 03, 2005 - 06:31 PM


which would be a better exhaust system for my yz450f. the factory 4 with a powerbomb header, or the pro circuit t4 system?

  • grayracer513

Posted March 03, 2005 - 06:50 PM


They're nearly identical in performance. The test I have on an '03 showed the PC had a 1/2 hp more 500 rpm later than the FMF, but the FMF was stronger low and midrange, and actually had a little more at 10,500 and 11,000. Both put about two over the stock exhaust.

That said, I like my FMF Ti 4 a lot. :)

  • Joe_Jet

Posted March 03, 2005 - 07:17 PM


All things being equal I would go with the FMF. However, is having a huge sale on the White Bros Carbon Pro complete Carbon Fiber Ti system for $500 and $350 for the Al Ti system!

  • Ben Mens

Posted March 03, 2005 - 08:19 PM



Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • mxracer452

Posted March 03, 2005 - 09:17 PM


has anyone found, seen, or have sound test results for the fmf factory 4 and the powercore 4 systems????...if so...where can i find them?

  • gonzo

Posted March 04, 2005 - 04:14 AM


I have the FMF and love it. It sort of smoothens out the power of the bike. Havent tried the other systems though.

  • Ga426owner

Posted March 04, 2005 - 06:41 AM


which would be a better exhaust system for my yz450f. the factory 4 with a powerbomb header, or the pro circuit t4 system?

better in regards to what??? They are both similar in power.....what are you trying to accomplish?
For max power gains the White Bros Alum Race Series and or Carbon Pro is the way to go and for 350.00/500.00 for the complete system you can not beat this price anywhere. Motosports outlet.

  • mitchwilliams

Posted March 04, 2005 - 07:02 AM


The new '05 model of the FMF pipes will ship in about a week. They are on eBay now...will ship when they are released. FMF Factory 4.1 Carbon & 4.1 Titanium full systems. Auctions are $620 for the Carbon and $540 for the Ti.
Bottom Drawer acing
Same seller can get '05 White Brothers Carbon Pro II and Aluminum exhausts also. The $500/$350 White Brothers pipes are last years models on clearance....still a good deal though.

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