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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: 5527
Location: CHICAGO
Year and Trim: 2006 STS-V, 2004 GTO, 2009 G8 GT
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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2007 Chrysler Town & Country Limited: Daddy's beater affectionately called the Rolling Garbage Can or "RGC" for short
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PostPosted: Tue Jun 26, 2018 3:11 pm 
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Joined: Tue Aug 25, 2009 8:32 pm
Posts: 4399
Location: Dearborn, MI
Year and Trim: '93 SSEi
'05 STS-4
'97 Camaro
'97 LeSabre
The STS has a boot that fits a coupler on both sides, the FWD cars I believe have a coupler on one end and a flange on the other.

I was able to change mine out for a silicone coupler to remove a little bit of restriction from the accordian shape in the boot; but I mainly did that because the old one was cracked.

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Runs:
'93 Pontiac Bonneville SSEi - Twincharged, manual, and lots more! Build thread
'97 Chevy Camaro - 3800, T5, T-tops, Getting ready for some major upgrades!
'05 Cadillac STS - V8, AWD, her DD
'92 Olds Trofeo - Fair weather DD
'84 GMC Sierra Classic - Twin turbo 3800
'97 Buick LeSabre - L67 winter DD
'92 Pontiac Bonneville SSE future project

Doesn't run:
'87 Buick LeSabre T-type - future victim
'67 Buick LeSabre - future victim


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