i run the yosh trs full system,and my quad hauls azzz.power everywhere from top to bottom.dont know anything about fmf,im a yosh guy.ill put it to you likr this.at dumont my quad pulls very hard all the way up the hill and beats alot of other 450's.im not sayin its because the pipe but my results have been great,and i love the triangle shape.i would say as far as loudness,mine isnt any louder than the other 450's out there.you can get a trs full system stainless steel on ebay from motoxoutlet for 399.00.hope this helped you.good luck.also if you really want to know whats up with your yfz,go to daddogs website.

 

My mistake, thought you knew about the yoshi pipe, so I stated pretty cocky. Going with the thread, my buddy just got a brand new factory 4 from fmf, we are going to check it out on sunday against mine and my friends yoshi. Well be swithching riders. Oh, I forgot it's a full system.

 

My vote is for the DUNCAN FATBOY 4.I don't think you can go wrong with YOSHI or FMF

 

Thanks for the help guys, i havent made a choice but at this point they both look good. I called Yoshi and they said they don't make their cool little heat shield for the YFZ, so I would have to bolt the stock one on, so Bigdaddy660r was right. and FMF wants another 50 bucks for thiers....which is putting their system at around $630 from rocky. Thats alota damn money...... Thanks again!

 

Well, I went with the HMF Full System and had the head pipe JET-COATED[img]i/expressions/face-icon-small-smile.gif[/img][img]i/expressions/face-icon-small-smile.gif[/img]. I like this pipe alot, it works good from the bottom to top of the RPM range with a very strong pull all the way through.........

 

FMF all the way. Also take a look at HMF. They make damn good pipes!

 

I love my HMF. can't go wrong with the price and performance. I would reccomend it for any YFZ owner.

 

Hey,

I Have a full Yoshi system on my YFZ and love it.. just make sure you jet it right after you put it on. You will love it.. take a look at my pics i have posted.. I love the sound too I got a chance to hear it from a far when my friend took it around a few times to give it a try.
I used the oem heat shield on the new header, its made to fit it.
Good luck... take it easy!

-Jason

Yoshimura TRS Full Off road System No. 2375500-SA.
Pin (NCVQ) at clip postion 3
Main jet No.170
48 pilot jet
Mixture screw: 2.75 position
Pro Flow Foam Exhaust kit with airbox mod

 

Another for fat boy4 really good pipe [img]i/expressions/face-icon-small-happy.gif[/img]

 

I ended up going with the Yoshi Titanium system, I could'nt be happier with it. It sounds great, performs better and the construction was perfect! All the welds and bends are right on! It is expensive as hell but I would recomend it to anyone who doesn't mind some noise. Thanks for the help you guys!