Hi all! I just wanted to ask if anyone has used the Summit EFI upper intake manifold and what your experience was like? SUM-226100

Or is ATP still the recommended aftermarket UIM?

I would get the Dorman part. That Summit p/n has folks complaining about cracking the plastic with stock torque spec.

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95 SLE... a keeper. 241k miles. Low and Slow.
97 BMW 528i
98 Infiniti vq35'd i30: 13.3@104mph, 30MPG Hwy (RIP)
02 Jag X-type
03 BMW M5
05 Chevy Cobalt LS
07 Infiniti G35s 6MT (Sold)
07 Ducati Monster S2R 800 with DS1000 swap
83 Yamaha IT175K
72 Yamaha DS7: '74 RD250 swap, JL chambers

Info on dropping a 92-99: Here.

I'm seeing a lot of recent negative reviews with the dorman, whether it be defects in the shape of it, gasket not lining up, or bolt holes cracking in the same way

I've personally installed dozens of Dorman's with no come-backs.

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Andrew - owner/operator of Bonnevilles Unlimited

2004 Bonneville GXP | 60k | White Gold Tricoat | custom built supercharged 3800 hot rod | garage queen
1997 Corvette | 55k | Silver Metallic | Z06 wheels | Date-night Hauler/Parts runner
2014 Town & Country Limited | Cashmere Pearl | 95k | Family Hauler
2002 Ram 1500 Quad Cab Sport | Black| 260k | Official Bonneville Hauler

After my original UIM failed at 60ish thousand miles in 2012 I put on a Dorman. It lasted until about 170k in 2018 before it too burned through near the EGR. But that is approaching double what the original one lasted. I tossed on another one. Over 245k now. If it happens again, I'll just do it again lol People might be strong arming them a little bit. Just tighten it down carefully.

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-Car Guy Carl
"Penelope" - 2003 SLE - 247k Miles
"Sydney" - 2000 Honda S2000 - 98k miles