Yeah, that seems like something is wrong, I have the same exact duners kit and clutch from UTVCRAP.
I gained higher top end, along with the better climbing with the duner spring. You should be faster, not slower.
Jokar Grab Bar |Crow 5 Pt. Harness | Dynatek CDI | BRP Harness bar |BRP dash/voltmeter & buttons |SSV Speakers Amp & Bluetooth IPOD stereo | Rais tube on Uni billet intake | iShock 3.5 Mid and revalved Sport Shocks | Douglas beadlocks and paddles (Dunes) | HID Headlights and 4 Kragen HID 7" | ALBA alternator kit