You won't be getting up to 15 additional HP from little Yosh cams unless your existing Power Commander map is already robbing you of HP.
Assuming you already have a fully optimized Power Commander map for your existing mods; if you were to simply add Yosh cams, realistically, you could only expect to make an additional 4 to 8 peak HP depending upon their lobe centers.
Realize that the little Yosh cams offer very little improvement in lift (just .009†over the OEM intake cam and only 10 degrees more duration), so 15 HP due solely as a result of the Yosh cam install is a bit rambunctious/over-stated.
OEM Intake cam:
Lift = .345"
Duration = 234 degrees
OEM Exhaust cam:
Lift = .294"
Duration = 214 degrees
Now the little Yosh cams...
Yosh Intake cam:
Lift = .354"
Duration = 244 degrees
Yosh Exhaust cam:
Lift = .307"
Duration 230 degrees
I would install a 2nd OEM intake cam on the exhaust side before I’d waste my money on a set of meak/mild Yosh cams, as the OEM intake cam on the exhaust side would yield slightly more duration and much greater lift than the Yosh exhaust cam.
If insisting upon installing a set of cams that make a difference, I’d install a set of Web .378â€/.330†cams (I’ve been using these Web cams for the past 27,400 miles now with no issues). I also installed APE Performance Valve Springs, APE Titanium Retainers to provide adequate “valve free travelâ€, and APE Adjustable Cam Sprockets and degreed the cams at 105 Intake, 107 Exhaust. I also installed at that same time, higher compression 12.3:1 stock bore JE pistons. It pulls great from idle to redline and that’s why I can use taller gearing than stock. When I made these mods years ago, I didn’t have the extra $500 to have the cylinders shipped out, bored and replated, so I simply threw in the stock bore higher compression pistons to improve low-end HP. The higher compression JE pistons improve HP throughout the engines RPM but the higher compression really makes itself apparent at low RPM compared to 11:1 stock compression pistons. I always highly recommend that if you are going to install cams, make them work for you and also install higher compression pistons even if they’re only higher compression stock bore pistons. 13:1 stock bores are ideal for this cam combo.