xr650r- wb e-series slip on vs pc t-4 full system

I have a friend selling a WB E-series slip-on (uses stock headers) for the 650r and I was considering the Procircuit T-4 Full system (Header and pipe).


What would you guys do? Also anyone have experience with thunder alley for the 650r? I used to have a barnums pro exhaust on my old bike and loved it but sold that bike long ago.

Is it the older version of the E series with removable baffle plates on the back? I sometimes run one of those, and many strangers have commented on how good it sounds. It's loud, though, when used with enough plates. It seems to increase low end power noticably.

Yep its the old one you can tune with the discs.

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