Comp Cam's new THUMPR line...

Has anyone tried the new Comp Cam's Thumpr, Muthr Thumpr, or Big Muthr Thumpr cams?  Just curious if it really does what is advertised... (Big cam sound, while keeping streetabilty and bottom-end torque on a mild engine) I know it's not really "new", it's been out well over a year now...  
1966 Mustang A-code, 4-speed coupe
1966 Fairlane 500
1994 Mustang V-6
1995 Ford Ranger extended cab
2002 Ford Explorer XLT

After looking over the specs, what they look like is a set of cams with a narrow lobe separation angle and 5 degrees advance if installed at the quoted intake centerline.  The narrow LCA give overlap, which contributes to that low speed lope and the ICL tries to get some torque back into the cam.  Then they throw in a bunch of exhaust duration.  Even the Thumpr seems a bit big for a normal 302, with 227/241 intake/exhaust @ .050.  Not real big for a 351 however.  You might have to jet up a little - that big exhaust duration might lean it out a bit.  With those specs, probably sounds as advertised.  On a shock tower car the extra exhaust duration is usually a given anyway.  
1967 Falcon 4 door 351C-4V
1970 Mustang 351C-2V
http://raceabilene.com/kelly/hotrod
Owner built, owner abused.

"On a shock tower car the extra exhaust duration is usually a given anyway."

Explain why the suspension style has anything to do with how long the exhaust valve is allowed to stay open; maybe I'm not understandind what you are trying to say.  
1966 Mustang A-code, 4-speed coupe
1966 Fairlane 500
1994 Mustang V-6
1995 Ford Ranger extended cab
2002 Ford Explorer XLT

The header pipes have to make a sharp turn right off the head to clear the towers.  It's a bit worse on the 289/302/351W because of the head layout than on a 351C but it's still an issue.  The turn adds a bit of restriction.  Most stock small block ports don't flow well anyway and turning the pipe right off doesn't help.  If the pipe could come out straight from the port and then do a gentle sweeping bend it would not be a problem.  Even if the head is ported, or if using a modern head with good ports, you still have the header pipes turning almost as soon as they leave the flange.  So extra exhaust duration helps crutch around that issue.  
1967 Falcon 4 door 351C-4V
1970 Mustang 351C-2V
http://raceabilene.com/kelly/hotrod
Owner built, owner abused.

Thanks for the explanation on the headers!  Could you also explain the "5 degrees advance" part?  I've read several articles where this stuff was mentioned but I've not found an explanation yet.  When I've worked on engines (mostly 302's) I've always been able to cheat and not remove the distributor or otherwise have to work on timing so now that I'll be building a motor in the next couple of years I need to learn it.

Thanks!  
67 Mustang Coupe
302 .040 / C4 / 8.8

Apologize if my protocol is incorrect, but first time user and I need some help.  2005 Mustang 4.6 Steeda with Vortex Supercharger.  Just bought the car few weeks ago.  Has 41K. I have a misfire on 4 & 7.  Swapped coils around, still on 4 & 7. Injectors are firing.  When I did visual found PCV hose off.  Haven't pulled plugs, well because we should all know the issues with these plugs and don't want to have to pull them at 41K unless have to.  

Has anyone had or heard of this issue before?  

I'm gonna bet that because of pcv hose, you had a lean condition on those 2 back cylinders. With that many miles I will also say, put a new gas filter on the car [a good one that says ford on it]. We run into more issues with plugged filters than you can count.