Martin -- double check your HP numbers again. If you're still running 8.5:1 heads with original cams and valves, sincerely doubt merely changing fuel metering and ignition curve adds more than 10+ HP to DeLo engine. B280 was massive PRV redesign to get to 170 HP. Way more than difference between B27/B28 or E/F series. Bill Robertson #5939 >--- In dmcnews@xxxxxxxxxxxxxxx, Martin Gutkowski <webmaster@xxxx> wrote: > What you need to do is drive the _same_car_ before and after. You'll > feel it then. DeLoreans are all the same yet so many are different. A > friend of mine could outrun me with his stock system when I had my cat > bypass pipe in (but before the 170hp upgrade). Even my PRV guy says that > no two of these engines are the same - you'll get one that goes like a > scalded cat, and one that doesn't, and for absolutely no apparent reason. > > Martin > > Louie wrote: > > >I've driven several DeLos without > >cats, and I can't say I can feel any difference in performance, > >though Martin & Co. claim 10-15 hp bonuses from this. > >