I have an 05 TRX450R with a filter and HRC kit installedand and although I felt significant gains with the HRC Kit over stock cam and end cap I want more. My questions is, should I go with a full exhaust next or just the slip on. Will I really feel any difference between the uncorked stock exhast with the HRC end cap and a slip-on or full pipe. Can I just buy the slip on or should I replace the stock head pipe. Thanks guys.

You should replace the stock headpipe for sure. The 04/05 hrc kits didn't come with a headpipe so it's a huge restriction. You can use the 06+ hrc headpipe but you have to run an 06+ slipon exhaust too or you can find a good deal in the for sale section of this site. I picked up my like new sparks exhaust for $300 shipped. Can't hardly find a hrc headpipe and slip on for that price so I coudn't pass it up.

LRD Pro 4 Series is pretty cheap. KB's got -20 % on them right now, so U can got them in really nice price.

Thanks for the referral. We really do appreciate it!

We also have an ESR full race exhaust for 300.00

ESR Race Exhaust

full.

got any pics?

Vade, I wish I did. The Race exhaust looks a lot like the Pro Series but the mounts are welded to the canister.
KB Motorsports