thanks for this- would you go this route? my car is a 1993 GT and installing a terminator ecu? my old set up is mac longtubes, mac mid and flowmasterYou can still find 3” stuff.
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As for the tail pipes need to know LX or GT. Pypes Performance Exhaust has 3” cat backs.
I figured i had 1 3/4 bbk long tubes - and needed to complete the set up or should i just stay with my Mac longs 1 5/8 set up ? not sure if the bbk will fit the mac midpipe. I guess im looking for opinions with my 347 set up.Is there a reason you want or need 3in?
2.5 is big enough for the vast majority of setups.
thanks for this... i have a complete set up with my mac long tubes 1 5/8 with mid pipe. and cat back... but purchased some bbk longtumes 1 3/4 and was pondering what i should do.I have an injected 331 making in the 460fwhp range (engine dyno’d with a carb before it was installed) and I am running a full 2.5” exhaust with shorties through a 5 speed and an 8.8. Made around 370 rwhp on a Mustang dyno. Would it make more with full length headers and a 3” system? In short absolutely.
So with that if I already had a 2.5” system would I move up to a 3”? Probably not unless I was racing.
My T-Bird has a custom made 3.5” / 3” system with a 351W that is 0.03” over.
I personally think that when you hit the 350ish cubic inch mark a 3” or larger system makes sense $$$ wise if you are wanting it to perform. And especially if it’s a striker. They will run on a 2.5” and smaller system all day long as the old big block cars of the 60’s, 70’s, and early 80’s proved albeit horribly.
I bought this engine with the info you see in the below pictures. I purchased Holley Systemac intake and terminator ecu with 24 lbs injectors 65mm throttle body with anderson power pipe... my current set up has the mac long tubes 1 5/8 that i can reuse or figure out a new set up with my BBK 1 3/4 ....Can you detail your 347 build? Stock or CAI, throttle body, intakes, heads, cam, compression ratio, and what will your shift point be?
I limit myself to about 6200 on shifts but can spin it pretty tight with the hydraulic lifters and stock block (6600 to 6800) but on the dyno it all starts falling off around 6400. If I do anything else it will be a solid roller cam and aftermarket block so I can move the shift point up. Stock blocks don’t particularly like high rpm shifts while north of 500 fwhp. Will I ever do it? Probably not unless Blue Print starts selling the four bolt main block and it’s half of a Dart block. Anyhow, all of that and I’ll still keep the 2.5” exhaust.
Thanks for this response- price of 15k was canadian as i live in Canada- will likely just be a street car... i think ill stick with what i have and sell the BBK headers....what size throttle body do you recommend for the holley intake? i was told the 24 pnd injectors for this set up was plenty.....but i can still change this..Looks like a pretty solid build, though the 15k estimate is probably off.
You can goto fordstrokers and build a 347 with a Dart block and come up a couple grand under.
Not sure what you plan to do with the car, mostly street? Mostly drag racing? Road course?
Be realistic, i used to think street track, except i never went to the track, lol.
I don't see many Pros in the 3 inch.
Probably be crazy loud without cats.
Probably be crazy expensive with the cats.
Could have rattling issues going over the axle. You certainly aren't using road race style parts and an off the shelf catback.
Gains at this HP level will probably be minimal since you already have 1 5/8 headers (lmr states 20hp over STOCK headers)
Let's say they do gain 10hp over what you have now which is likely 400-425rwhp, is 10 more hp really going make it much better?
BTW, a quick search (could be wrong, not foxbody specific), suggests the collector on BBK 1 3/4 long tubes is 2.5 anyway.
I'd run what you have now and if you want to mix and match exhaust parts later, go ahead.
What i wouldn't do is run 24's or a 65mm Throttle body, your setup most likely exceeds both.
i just realized my throttle body is a 70mm BBK ( i still may upgrade to a 75mm accufab) but you have me shopping for injectors now.,.. with the terminator what injectors and brand do you recommend I get?If the systemax will accept a 75mm (and i think it's one of the few that will, again check), i would run a 75mm accufab, i'll agree they are just the best, period.
If you were going to run the stock computer i would for sure says 30's, but since it sound like you are going to run a terminator setup, you have the ability to adjust for the injector size, so you could go bigger.
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