XR400R Exhaust HP, RPM & Torque Comparison Chart on 4Strokes.com

4Strokes.com Honda Technical: XR400R Exhaust Comparison

The following HP and Torque figures were created by Jack Jensen back in 1999 using a stock 1998 or 1999 Honda XR400R. We do not know what Dyno was used nor any other particulars about the Dyno runs. Please keep in mind that these figures were gathered from exhaust systems produced prior to year 2000.

Exhaust	Max HP	@ RPM	Max Trq	@ RPM	Max RPM	Weight	Cost*
Stock Exhaust	30.7	6500	25.3	6000	8700	3.20	none
Big Gun	32.1	7000	26.3	5700	9000	4.80	$385
Dave Miller Concepts (DMC)	32.5	7300	25.5	6200	9300	7.11	$529
FMF Megamax II	32.0	7000	26.6	5250	9250	5.30	$250
FMF Powercore	32.0	6750	26.4	5500	9000	5.30	$240
Noleen	32.7	8000	24.7	6500	9250	6.00	$250
Pro Circuit	31.5	8000	25.7	5250	9250	5.80	$195
Stroker SX1 race	31.6	6750	26.2	5750	9250	4.00	$200
Stroker SX1 spark	32.1	7000	26.0	6000	9250	5.10	$235
Supertrapp IDS	31.2	7250	25.8	6000	9250	5.40	$230
Up-Tite	33.0	8000	23.9	6750	9250	8.70	$290
White Brothers	32.4	7500	25.9	6000	9250	5.90	$290
Yoshimura	31.5	8000	24.0	6250	9250	6.90	$350
*As of July 29, 1999

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