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PostPosted: Thu Jun 14, 2018 2:17 pm 
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Joined: Sun Jul 03, 2016 3:20 pm
Posts: 3
Year and Trim: 1991 SE
2004 GXP
As some have experienced the dreaded intake plenum boot crack leading to the P0174 P0171 codes I noticed the size of the gasket.
It measured 71mm across in one direction and 72mm in another.
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https://drive.google.com/file/d/1ll6hCfpsvLOLq0WxTgvzjJ1fLD-LXQna/view?usp=sharing

This made me realize we are not getting the full benefit (all be it minor) of our stock 75mm TB.

Does anyone know if an improved design available?


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PostPosted: Thu Jun 14, 2018 4:23 pm 
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Certified Bonneville Nut
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Joined: Wed May 13, 2009 10:45 pm
Posts: 5432
Location: CHICAGO
Year and Trim: 2006 Cadillac STS-V, 2004 Pontiac GTO
I did not. I know Mattstrike did a bunch of intake work on his '05 STS, but I don't think he modified anything. Just fixing/cleaning up old crud parts

I think if you want to make any mods like this, you're left to your own devices.

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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

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