So my "moderate estimate" was pretty close. The OP has a Stage I already so he'd be looking at a minimum 10+10 with a cam only install.

 

How's the mpg gonna suffer when cams are put in?

 

Hmmm, I'm not "too" concerned about mpg... Is there much, or a change when you do cams?

 

I had no change in mpg when I did mine. 38-40

 

Here it is in black and white..There are three things that will give you the most bang for your buck in increasing horse power...

1.A good set of pipes with proper back pressure...
2.Air Flow...A good Air Filter system will make all the difference in the world...
3. Ignition..Upgrading your Spark and increasing your burnt fuel ratio...

Things that can cause major off the line performance differences
1. Sprocket ratio..This will turn a dog into a monster off the line but will limit can limit the top end significantly..
2.Tranny gearing

If you want to increase your horse power Dyno your bike it will tell you in black and white the best way to increase your performance...

I run a 01 wide Glide that has the 95 inch kit installed but have taken down many guys running big inch bikes..The reason is simple I have installed the right parts for the best performance ..

Do not rely on engine size alone to give you horsepower..
Save your money on that big engine Dyno your bike and get it setup with the right fuel to air mixture ,Back pressure and spark and knock the crap out of the cookie cutter choppers with there big inch engines...

 

theres a good cut and dry way to look at it. Thanks for the post. This thread is full of good info. Thanks to everyone who contributed!

 

To add onto a comment above....don't underestimate what a good pipe can do for performance. It's probably the most significant single change you can make. If you want real performance, you gotta go with a good 2-1 system....D&D, Pro Pipe, Thunderheader, Bassani, etc.

 

delete

 

..........with a tune. without a tune, gains are minimal and in some cases can actually lose power.

 

Yes, I guess I assumed that was a given but should have said it.
Especially when going to a 2-1 system, a good tune is critical.
Any performance mod is worthless without the right tune, including changing pipes.