Well I was pleasantly surprised to find out that the bike (04 wr450) I bought last week has the GYTR insert on it. I'm such a newbie that I thought it was the stock exhaust. My question is isw the insert basically all I can do to maximize (oxymoron) the stock exhaust or is there a way to take it a step further. I almost had bought a aftermarket pipe on ebay but was happy to realize I at least had the insert for now. I've already done the 2 airbox , grey wire and YZ throttle stop mods and the stuff to finish out the free mods are arriving tomorrow. I just want to make sure that the previous owner didn't leave out a step when he put in the insert if there was something else such as removing a 2nd baffle or something.