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Does the Dorman LS2 intake fit? Come inside and find out.
I thought I would share my findings with the C5 community. Yes!! It does fit, with a few slight modifications of course. A lot of speculation with this intake. I don't know what it will do for power or any of that but I do know now that it fits. First, you have to take the center clip out of the cowl. Second, you have to shave down the rear hold down for the MAP sensor. I was planning on relocating mine to the front anyways because of ease of replacement if need be. Along with that you will obviously have the extend the wires for the connector. Third, shave down the hump on the water pump. Doesn't need to be too much. Forth, steam pipes. I hammered mine down flat and it clears. I don't feel too comfortable with this so I will be making my own with some hose and tees that run around the intake. Personal preference I guess. Fifth, eventually you will have to hook up vacuum to the Hvac. Take your pick, a few vacuum sources available. Then put it in and torque it down. Also mounted an LS2 throttle body that clears. Hopefully this helps and let me know if you need any help.
that's about what I was hoping for. It's not a legit fast manifold but the lower section on the dorman has the same casting number. As far as the upper, I had it sitting next to my LS6 manifold and you could visually tell the runner volume was a lot larger on the dorman. And for $350 I thought I would try it out. Would cost the same to convert my LS6 to 90mm throttle body.
that's about what I was hoping for. It's not a legit fast manifold but the lower section on the dorman has the same casting number. As far as the upper, I had it sitting next to my LS6 manifold and you could visually tell the runner volume was a lot larger on the dorman. And for $350 I thought I would try it out. Would cost the same to convert my LS6 to 90mm throttle body.
You can't beat the price you get a fast bottom shell and a ls2 upper with tons of volume give it some time this manifold is about to become quite popular.
this is very interesting. i had thought the consensus was that the ls6 manifolds > ls2 manifolds. does it FEEL like you picked up some power? also, are you planning on dynoing it to see? this thread has delayed my ourchase of an ls6 one just to see.
this is very interesting. i had thought the consensus was that the ls6 manifolds > ls2 manifolds. does it FEEL like you picked up some power? also, are you planning on dynoing it to see? this thread has delayed my ourchase of an ls6 one just to see.
the oe ls2 sucks, if you read about the dorman it's actually a fast manifold lower section with a modified upper. I was just test fitting it the other day. My tuner is very busy and I don't have a tune until June 15th. I'm not sure how accurate my findings will be since I will be adding cylinder heads also but depending on what the numbers show I can compare to other set ups to see what the intake is doing for me. It's 1/3 the price of a fast so I thought I would try it out.
the oe ls2 sucks, if you read about the dorman it's actually a fast manifold lower section with a modified upper. I was just test fitting it the other day. My tuner is very busy and I don't have a tune until June 15th. I'm not sure how accurate my findings will be since I will be adding cylinder heads also but depending on what the numbers show I can compare to other set ups to see what the intake is doing for me. It's 1/3 the price of a fast so I thought I would try it out.
there is a guy on ls1tech that gain 150whp with heads, cam, and this intake. I don't think heads and a cam will net that much so it's gotta be doing something.
the oe ls2 sucks, if you read about the dorman it's actually a fast manifold lower section with a modified upper. I was just test fitting it the other day. My tuner is very busy and I don't have a tune until June 15th. I'm not sure how accurate my findings will be since I will be adding cylinder heads also but depending on what the numbers show I can compare to other set ups to see what the intake is doing for me. It's 1/3 the price of a fast so I thought I would try it out.
guess that settles it then! good luck, i'll be keeping an eye on this thread to see your results.
guess that settles it then! good luck, i'll be keeping an eye on this thread to see your results.
took the last 2 days and installed my new heads and intake. Along with this write up there were a couple more things to add. Had to modify the hoses for the pcv/valve cover breathers. No big deal tho. Just had the extend the hose from the drivers side about 3 inches. Also, the fuel rail bolted right in. No modification or extra brackets. Did have to trim off about 1/16 of and inch on the bottom of the throttle body for it to clear the water pump. And like stated before, I made my own steam tubes that run on the side of the intake. Starts up and runs good now I wait for June 15th to get here for my tune.
DO YOU HAVE TO GET A TUNE? = NO,, It will still work and provide some HP/Tq Gain.
SHOULD YOU GET A TUNE?= YES! To get the most out of any engine mod that you install, it should be tuned.
Any changes that you make to the engine between the MAF & CATs will effect the Volume Metric Efficiency (VE) of the engine. The VE map in the PCM is the heart of how the engine runs. If you look at your LTFT and STFT before and after the manifold swap, I bet ya that the LTFTs will be askew from the close to zero that it was in OEM form.
Anytime LTFTs are positive, they effect you're WOT Power Enrichment (PE) AFR in a negative way. The C5 PE AFR is slightly rich from the factory. Anytime LTFTs are positive, that percent positive value is added to the WOT PE AFR making it more rich. A rich PE AFR does not make as much power as a leaner PE AFR.
What did you use to move the MAP? Looking for that kit, or if you remove the "plug" does the dorman just let you plug it in and use the screw to secure it? Have one on my dads C5 and need to move the MAP.
Last edited by nullpointer; 08-21-2017 at 02:27 PM.
What did you use to move the MAP? Looking for that kit, or if you remove the "plug" does the dorman just let you plug it in and use the screw to secure it? Have one on my dads C5 and need to move the MAP.
not sure if there is a kit. I just cut the connector off and extended the three wires to reach the new location.
05-06-2017, 10:51 PM
Does the Dorman LS2 intake fit? Come inside and find out.
