You need to look at gains across the powerboard instead of peak hp only, even more so on a torque monster such as the M5. High RPM arent its forté!
We're expecting much better results with a catless tune as the ECU simply cannot and wont adjust to the newly released exhaust flow. I would not expect a tune to allow this engine to breath much more at higher RPMs but would add tremendous amounts of mid-range performance.
Max horsepower +7,7 hp @ 5770 rpm
+16,5 hp @ 2900 rpm
+21,9 hp @ 4300 rpm
+21,2 hp @ 5400 rpm
Max torque +34,1 Nm @ 2930 rpm
+32,1 Nm @ 2100 rpm
+38,7 Nm @ 2900 rpm
+31,2 Nm @ 4000 rpm
+30,2 Nm @ 5100 rpm
The catless downpipes were designed to fit with the OEM front pipes as well as any downpipe-back exhaust. Thery are 80mm in diameter with a 70mm slip connection. The microcats are an extra $440 for the pair. We use 2x100 CPSI HJS metallic racing catalytic converters either on the downpipes or the front pipes.
I hope this helps!
Originally Posted by mainly
thanks for your post, im definately interested. one thing for sure, no one can accuse you of fudging your dyno resuts to show bigger gains. 7 hp gain for all those mods. of course the question then becomes, is it worth 8-$9000 in upgrades for 7 hp?
i already have a tune. so ill have to check with my tuner to see if maybe it needs to be tweaked.
for catted version II, are these 200 cell cats?
btw, i thought dynos only showed wheel hp?