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Depends...if you are being all purist then manifolds. Other than that I can't think of any good reason to use them. Do yourself a favor and strongly consider TTi headers though. They will fit better than pretty much anything else.
Then get headers. 2.0 inch TTi's would be where I would go but there are cheaper ones out there. But remember...like anything else you get what you pay for.
The Headers will make a good 10%+ more (if not more) HP/TQ even on a stock engine, than a "ported set" of HP manifolds, you don't get the reversion effect with headers that you will get from the HP manifolds, a free flowing exhaust after the headers is equally important... Remember an engine is a big air pump what you bring in needs to come out & with 500hp you will need to have headers or it wont flow for sh-t...
let me get this right--you got 500 hp-spent money on quality rebuild-now you wan't to choke it with mani. good luck you will need it--go with the--hooker super comp. headers--they will make a believer out of you as soon as you crank that 500 hp motor
I've had manifolds on my stock 383s and 440s. No need for expensive headers on those engines. I still haven't found paint for them that doesn't look nasty after a year or two.
Headers on any of the built engines I've had. Putting on TTi ceramic coated headers with thermal barrier on the 522 stroker just built. The rest is an X pipe and 3" pipes and will be modified with cutouts. It needs to breathe-
537 hp @ 5300 rpm
640 fpt @ 3600 rpm
Avg. 506 hp from 3000 - 5800 rpm
Let me just say from experience now, I went the "cheaper" route and my pipes hit and the motor almost didn't fit in the mounts because of it. If your going to have a high hp motor than go with the tti's they will fit and look good don't make the same mistake I did! I will be changing mine out one day....
Aside from looking cool the only advantage the manifolds have is that they will be much more quiet.
But that probably isn't an issue with a 500 HP build. Headers are your best route. I like the coated hookers.... They always seem to work well on Mopars. I'm sure TTI is a good product but Hooker has been around since the 60's. Must be something to that....!!