ORIGINAL: silver05GT

Well I already have a custom 3 inch side exiting exhaust with flowmaster 40 series mufflers
Thanks John

ORIGINAL: DAVE05GT

ORIGINAL: silver05GT

What kind of sound benefits can I expect from the shorty headers and also my main question is how difficult to install. I understand the lack in hp improvements but I like the idea of sound and better flow of air. But if thats the case Im just going to get some mac shorties for like 400 instead of JBA shorties for 700 do you guys think thats a wise install and Ive done motor work before I have a 1970 Mach 1 with a 408 stroker that I worked on so I have some experience but I am more concerned with space I dont want to have to deal with it if it requires pull the engine out slightly i just want to know if they can fit in there easily.

Thanks John

ORIGINAL: DAVE05GT

I believe BBK, MAC, and FRPP are all optimum length which I think means that they are the lengths that those companies found worked best on their dynos but I'm not sure. I've always heard you want to go with equal length headers for obvious reasons.

What do you all think of BBK getting 17hp max on their headers? I'd say pretty good if true and the price is right. RPM's page also states no additional modifications necessary so I guess you don't need the new motor mounts.

ORIGINAL: F1Fan


The reason JBA's shortys cost so much is that they took the time to actually design and dyno test several versions of these headers before going into production. I looked at several of the other brands including FRP, BBKS and MAC's (Kook's mid's were not out yet), and the only design to get even close to equal length and as long a tube as possible was JBA. All the others are basically tubular versions of the stock cast manifolds and are designed to be easy to install. JBA does not subscribe to this approach, they used every available inch to make their headers work and still fit the car. Look at JBA's images of their shortys they have long flowing tubes and large radius bends. JBA headers are all stainless steel and the upper models are ceramic coated. JBA's shorty headers have a nice collector and anti-reversion flow diverter they call a "firecone", all of these details are why JBA's cost more and make power. JBA doesn't make any wild HP claims but they do confidantly sell you they headers knowing that they are as the best available for the given restraints. When your MAC's or BBK's rust out or crack the cost of the JBA's will seem like a bargin.

Cheers