When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
They’ve been in development for a while but the new Summit Max Efi Ls intakes are out! The taller profile ones have longer runners and more plenum volume (9.7L) than typical sheet metal Ls intakes. Mid and short profile, Rectangle and Cathedral, Black or polished, 92 or 102mm Tb versions. Better mixture distribution and performed well in our testing. $499 (with fuel rails) introductory price too!
if you go into the photos, check out the 360 view and you can see the runners and bells extending up into the plenum rather than cut-off at the surface. The plenum material is thicker than what’s commonly used so good for boost!
Generally we don’t compete head to head with our vendors (nearly everyone) so they usually end up in the hands of a third-party like Richard Holdener. Let us see what we could give as a comparison.
I bet the power curve will look like the FAST with the mid-length runners. I wonder if this will fit under my hood.
It will be curious to see. We have a fourth Gen Camaro and we're probably going to swap intakes on it to verify whether the low (and possibly the high) profile versions would work,
Would it be possible to get pics detailing the height difference between the new Summit intake next to the LS6 and LS3 intakes? Maybe just put them on a table and take few pics with a tape measure.
Would it be possible to get pics detailing the height difference between the new Summit intake next to the LS6 and LS3 intakes? Maybe just put them on a table and take few pics with a tape measure.
On it. The physical height at its peak is 7.480 for the low and 8.270 for the taller one, but it doesn’t really describe the slope down that people will be looking at to clear cowl’s. We’ll pull them and get you folks some good data.
On it. The physical height at its peak is 7.480 for the low and 8.270 for the taller one, but it doesn’t really describe the slope down that people will be looking at to clear cowl’s. We’ll pull them and get you folks some good data.
Out of curiosity, do you have any dimension drawings showing the centerline of the throttle body bore? I'm curious to see which intake will work best on my race car to clear the front support brace. Also, it looks like there's a MAP sensor port on the back, is that correct?
Also, do you know if anyone from Summit Racing will be at Mid-Ohio for the Hoosier Super Tour race this weekend that I might be able to talk to about this more in depth? I know I need to get a shorter runner intake manifold for my setup, and this looks like it should work well for my application.
Don't manifolds of this general shape have no bottom end power N/A? I know it's not good to make generalizations or assumptions lol.
I'm happy with the performance of the NNBS intake but holy ***** it is FUGLY!
How long is the introductory price so I know how long I have to be tempted for?
Those fugly truck manifolds can be smoothed and painted to look pretty decent. No need to be stuck with a glob of black plastic with **** sticking out all over it.
First up is the Tall Boy:
- The top peak of the throttle body flange is 8.5”
- 3* plenum taper to 7" over top of the rear-most runner before heavy radius down to 6.5" at the back.
- The 2.635" x 1.018" runner at the intake flange (not including additional in the injector boss area) is about 2.7" CSA. The runner is 5.5” long and measures 2.150" I.D. below the bell which equals 3.63" CSA to give you an idea of runner taper.
-12.85 lbs. without fuel rails so lighter than cast manifolds by a large margin.
-Throttle body face extends 4.625 in. forward of front-most driver’s side intake manifold bolt for reference.
-Fuel Rail I.D. .702 for M1 if required.
Next up is the Lo-boy:
- The top peak of the throttle body flange is 7”.
- 1.8* plenum taper to 6” over top of the rear-most runner before heavy radius down to 5.25" at the back.
- The runner length is nearly the same as the Tall-boy at 5.25".
- The difference is the whole plenum is dropped over the runners. The underside of the plenum is only 1.500" above the valley vs. 2.900" above the valley with the Tall-boy. The runner protrusion into the plenum with the Lo-boy is 2.250" vs. 1.500" with the Tall-boy. This means that torque with the Lo-boy isn’t going to be *that* much down on the Tall-boy. Also 12.85 lbs. without fuel rails for a lot less weight than cast.
It will be curious to see. We have a fourth Gen Camaro and we're probably going to swap intakes on it to verify whether the low (and possibly the high) profile versions would work,
New Summit Racing Max Efi intake manifolds. 
