This is just to relate my Valair NMU70241-01 HD clutch experience. I thought I would save some money and use the Valair and was told it would hold under the Dp tuner on 140 extreme........it doesn't.:doh: It holds better than the stock clutch to be sure but it still slips. I usually break in clutches for 500 miles but broke this one in for almost 1300 since they told me it has a 1000 mile break in, I wouldn't even let my 16 year old use it for driving lessons. On 140 extreme in 5th or 6th if you floorboard the go pedal hard it slips. I knew I should have just saved a little longer and bought a South Bend. With this economy and fuel costs its gonna take awhile to save the cash but I will be replacing this thing with a nice south bend as soon as I can and since I want bigger sticks and a bb turbo I'll just save longer and get one that will hold that. I used the 140 extreme for the first time with this Valair clutch yesterday on my way to work in the morning, I think I cursed that thing all the way to work after it slipped. This clutch was installed on the 99 in my signature.