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Hey all, I'm going through my 92 and doing as many upgrades as I can to it. It was suggested to improve the air in and the exhaust out. It was recomended to me to go 3" all the way. Suggestions of hooker headers and Dougs D901 y pipe were perfect fits for my 92. I just got them and noticed that the out let pipe on the y is 2.5" So is there any true 3" all the way exhausts. The hooker y pipes also reduce as well. Trying to see why change the headers if I already have a 2.5" exhaust on the car now. Is just changing the headers and y pipe going to make that much of a difference. I'm still choking it down. Maybe I was confused. Thought flow was the whole point? Suggestions please.
I think dyno don has a full 3" Y pipe. Most people who get the D901 cut the 2.5 pipe off at the merger, open up the terrible merging and weld on a 3" pipe. There are a bunch of 3" catbacks
I have the same exhaust. Hookers and D901 Y. Had my guy cut the 2.5 in merger and put in a flowmaster 3in merger. Several companies make that y, think I got mine on Amazon
I’m looking at doing a true dual 3” all the way. But I’m running into a complete lack of room. Sorry to ask this question here, but what are some thoughts on trimming this area?
Just enough to get them to fit through.
I saw in another thread that someone removed that top black bar. I don’t think that’s a good idea but I’m not sure. I could really use some good input here.
I’m looking at doing a true dual 3” all the way. But I’m running into a complete lack of room. Sorry to ask this question here, but what are some thoughts on trimming this area?
Also remember that the pipes are going to move around slightly. If you only have just enough room, you might run into rubbing and unpleasant vibrations.
I’m looking at doing a true dual 3” all the way. But I’m running into a complete lack of room. Sorry to ask this question here, but what are some thoughts on trimming this area?
Just enough to get them to fit through.
I saw in another thread that someone removed that top black bar. I don’t think that’s a good idea but I’m not sure. I could really use some good input here.
I got a UMI Panhard Relocation Bar and that is exactly what I needed!
Before and After.
And a further back view of the whole area before and after.
Although I agree that dual 3” is a bit hard to route, I don’t think it’s overkill. Just complicated. I will be making about 530 HP so it’ll be functional.
Off topic but I'd like to see how level the panhard bar will be once the suspension is fully loaded.
EDIT: Having a better look it would appear the weight is on the suspension. Just through the jack stands.
You might be wanting to add the adjustable bracket for the axle side of the panhard bar so as to restore it to a level condition.
Hey all, I'm going through my 92 and doing as many upgrades as I can to it. It was suggested to improve the air in and the exhaust out. It was recomended to me to go 3" all the way. Suggestions of hooker headers and Dougs D901 y pipe were perfect fits for my 92. I just got them and noticed that the out let pipe on the y is 2.5" So is there any true 3" all the way exhausts. The hooker y pipes also reduce as well. Trying to see why change the headers if I already have a 2.5" exhaust on the car now. Is just changing the headers and y pipe going to make that much of a difference. I'm still choking it down. Maybe I was confused. Thought flow was the whole point? Suggestions please.
If you have a 305TBI 1986, there is probably no need for 3in all the way. A cat back with headers would be sufficient. I have 2.5" dual into 3" custom Y pipe + 3" cat back for my 383 TPI (around 415hp 400HP). Works perfect. But my old 2.25" dual into 2.5" custom Y pipe + 3" cat back was plenty on my old modified 305 TPI (around 270hp).
Last edited by SbFormula; Jan 24, 2023 at 09:53 AM.
You might be wanting to add the adjustable bracket for the axle side of the panhard bar so as to restore it to a level condition.
Possibly. I’m only aware that the Panhard bar controls the left and right sway of the diff. I have no idea how tilted or level it should or should not be. Let’s hear about it.
Short story is that the bar should be level at ride height.This way as the suspension unloads or compresses, the axle moves equally in either direction.
Dual 2.5 vs Dual 3 inch, hp difference on our 3rd/4th Gen cars at 500 to 600 hp flywheel hp?
Probably about 3 percent in favor of the Dual 3 inch system based on what Hooker shared when discussing their BlackHeart true dual 2.5 inch exhaust vs true dual 3 inch.
On LS1Tech saw a post where someone's car made just over 600 whp. He swapped out a Kook's true dual 3 inch for a BlackHeart true dual 2.5 due ground clearance issues.
He said Dyno showed the car lost ~17 whp peak to peak. Car gained ~5 wtq. The BlackHeart 2.5 fixed the ground clearance issues. Car owner said that was worth the hp cost.
So about ~3% hp difference and that matched pretty well with what the Hooker tech had said seems reasonable at ~600whp and probably even less at 400 whp.
I have 3" true duals and my only regret is not working on a different muffler configuration. I am using two bullet style mufflers due to the space constraints around the fuel tank. However, I may try to configure a dual inlet/outlet muffler in the stock location and have both exits to one since (they are tucked under). The sound is incredible, but will blow your ears out. The drone at highway speeds is enough for you to lose your mind. I have to run with the windows down and ear protection on. It's murderous on long drives. I need to make changes.
