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How much power gain with longtubes over factory manifolds?

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How much power gain with longtubes over factory manifolds?

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Old 12-01-2017, 06:54 AM
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Default How much power gain with longtubes over factory manifolds?

My car has longtubes now but I am starting to not like having them. I don't like the thin metal ticks, or the machinegun sounding rasp at common rpms, I don't like how low they hang etc. Considering swapping back to stock manifolds (or the new Hooker manifolds if they fit) and a custom 3" y pipe with a good merge. How much will the manifolds themselves hold back power? I know the swap from stock to headers/ory is like 20+ but how much of that is y design?
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Old 12-01-2017, 07:06 AM
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A good y-pipe design definitely helps add power over the stock y-pipe. Are we comparing a ORY to stock here?
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Old 12-01-2017, 09:22 AM
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Off road yes or one with good modern high flow cats.
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Old 12-01-2017, 09:30 AM
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I can't say for sure exactly, but I'm betting a good 3" ORY will provide as much gains as the long tubes themselves, when comparing to the stock components
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Old 12-01-2017, 12:10 PM
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So you think swapping to stock manifolds and a good ory from longtubes/ory would lose me maybe 10-15whp or so theoretically?
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Old 12-01-2017, 12:18 PM
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Yes theoretically
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Old 12-04-2017, 08:36 AM
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If you have old slp headers then the more modern design are a lot better and don't hang nearly as low
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Old 12-07-2017, 07:04 PM
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Nah mine are Speed Engineering.
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Old 12-07-2017, 08:10 PM
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After having just finished an install of the blackheart longtubes (and their matching dual system) I can say theirs tuck very nicely. I think that the exhaust hangs a little higher than the factory exhaust did, if not it's right around the same height. Looking forward to being able to easily cruise over speed bumps again! lol
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Old 12-07-2017, 08:44 PM
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That setup is now on my radar since I made this post. I tracked down some installed pictures and I am really surprised by the ground clearance it has. I wish there were more driving videos of it. Not 100% I like the sound of the mufflers yet.
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Old 12-07-2017, 08:52 PM
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A catted ypipe might help
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Old 12-07-2017, 08:55 PM
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I haven't been able to fire my car up yet (waiting on a tune) but as soon as I do I'll post a vid.

Worst case the mufflers are only clamped on and you could add something else to the system (or an exhaust shop would fab something as well)
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Old 12-07-2017, 08:56 PM
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Originally Posted by wannafbody View Post
A catted ypipe might help
And the exhaust won't make your eyes water....
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Old 12-07-2017, 11:40 PM
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How about the Thorley LS universal headers,, short tube twin Y..
I have their Tri-Y header on my jeep it definitely opened it up on long hills.
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Old 12-07-2017, 11:48 PM
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Tri-Y's are supposed to be better for the low and mid range, with the top end only a little less than full 4-tube headers.
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Old 12-08-2017, 12:03 PM
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I don't think the Blackheart headers are long tubes. I think mid length as to why they tuck up so good. A buddy also just installed their whole system. Said he's just chasing some little rattles here & there. He's happy with it.
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Old 12-09-2017, 11:37 AM
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Originally Posted by SoFla01SSLookinstok View Post
I don't think the Blackheart headers are long tubes. I think mid length as to why they tuck up so good. A buddy also just installed their whole system. Said he's just chasing some little rattles here & there. He's happy with it.
They look to have bot midlength and longtube options. I am curious what the ground clearance difference is between the two header options.
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Old 12-09-2017, 03:31 PM
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A midlength header will always have more ground clearance simply because the collector is further off the ground, and angled up into the engine compartment.
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Old 12-09-2017, 03:40 PM
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Yeah I realize that but I am curious about their clearance anyway.
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Old 12-12-2017, 09:18 AM
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I went TSP 1 7/8 to 3 inch ORY and love it. Bought the complete system from them for a little over $1k and install was a complete breeze.
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