Does anyone have any numbers saying which one is better? Has anyone ran either one and then switched to the other one and noticed a gain or lose?

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Red 2dr 99 GTP: Z7 t66, A/A IC'd, Custom Heads, 65# Inj, ST2 Cam, Meziere Elec Pump, JP Double Roller(with machined crank gear), Plogs, PLX W/B, Powrtuner

99 Regal GS (work car)

never had the blocked supercharger but i do have the L26 and when i get all the programing kinks worked out it should run really well

Friend of mine is using the L26 UIM and a PnP L26 LIM to match his heads. The car is awesome, now I can't really comment on the pros vs. con of the Blocked off M90 Vs. an L26. But I can only assume it's better, I'm lookign at my ported L36 LIM right now and think about it.

The Boost is filling the UIM and getting sucked into the cylinders like an N/A application, whereas the block off plate the boost is hitting the plate and be forced down, it must create way more turbulence in the intake.

I think more people don't swap over because the injector bosses are in the L36/L26 LIM, but all you need to do is drill and tap them for a 3/8th pipe fitting and put one in there. All of 30 mins work.

There are pros and cons to both, but overall on the street, the L26 would be better. A large, open plenum is good for an all-out drag car, the L26 helps spool and mid-range power...take your pick.

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i got one to sell if anyone wants it. candy purple powdercoated. from pector's old l36 build.

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98 XGT - 3.2/3.4, s&s, ported m90/TB/LIM, 1.9s, jp dbl; tinted, blacked out, lowered
soon -> e85, meth, and a lot smaller pulley

intresting

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2001 GTP street car- GT45 turbo,Stage 4 Intense turbo cam,FMIC,150 wet, double roller timing chain, Diamond forged coated pistons 8:0:1, Diamond piston rings, cryoed L32 connecting rods, Cryoed crank, Clevite77 main bearings, Clevite77 cam bearings, Clevite77 L32 rod bearings, ARP Everything, Intense/meizere true billet Flexplate, Custom UIM, Intense oil pressure kit, Cometic 4 layer head gaskets, OE-R lifters, Cryoed L67 block, ATI turbo dampner, MUCH MORE, 6 more to choose from ASE Certified

What about l32 long block with l26 uim and lim benn done does it even work....???

The bottom end of all Series II/III 3800s is more or less the same. It will work.

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2004 Impala LS - got some mods
NAIOA Moderator

Making you think twice before picking on Impalas

I concur. I put an L26 UIM on an L36 LIM on an L32 block and the fitment is all good.

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