Polished Plenum Extension
Joined: Aug 1999
Posts: 492
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From: Aurora, ON, Canada
Car: 1989 Iroc-Z
Engine: 5.7L TPI
Transmission: 4 Spd Auto
The corvette came with aluminum plenum extensions and thirdgens got the plastic ones as far as I know. You can pick them up off eBay for a reasonable price and go wild polishing them. Hope this helps...
Senior Member
Joined: Jul 2002
Posts: 704
Likes: 0
From: Granby, Ma US
Car: 89 WS6 Formula
Engine: 305 TPI w/ some mods done
Transmission: Modified THM700R4
no your 100% right. For some odd reason GM decided to give the camaro's and firebirds plastics ones....VS ones that came with the vettes were alluminum. So alot of people on here including myself have ordered the alluminum ones. Mid America sells them....so doesnt corvette central. To pass the little tip along though....make sure you get the screws with it also. 3 star head screws....cause the ones that came with 3rdgens wont work with an alluminum TPI extension. I believe everything cost me bout 40 bucks...so its not that bad. I got mine in and polished it by hand.....took me bout 4 hours. Well worth it. Here are some pics. Hope this helps.
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Junior Member
Joined: Apr 2002
Posts: 24
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Originally posted by Abubaca
By the way, nice 89. We both have fairly rare colors. My bright red and gold, your burgandy and red. Both have always been faves of mine.
very nice.
By the way, nice 89. We both have fairly rare colors. My bright red and gold, your burgandy and red. Both have always been faves of mine.
very nice.
Of course I plan on buying another one...or another f-body this spring.
OH yeah...thanks guys!
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Senior Member
Joined: Oct 2002
Posts: 530
Likes: 0
From: Nazareth, PA
Car: 87 GTA
Engine: L98
Transmission: 700R4
Here's one for sale on ebay http://cgi.ebay.com/ebaymotors/ws/eB...406189162&rd=1
Supreme Member
Joined: Sep 2002
Posts: 1,834
Likes: 0
From: Norwalk, Iowa
go to your local GM dealer and order one. the aluminum extension should run you about $20 and the screws are about $3 apiece, and you need 3 of them.
GM part numbers are 10108425 for the extension, and 14082425 for the screw(3x).
GM part numbers are 10108425 for the extension, and 14082425 for the screw(3x).
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Joined: Jul 1999
Posts: 13,579
Likes: 9
From: Readsboro, VT
Car: 85 IROC-Z / 88 GTA
Engine: 403 LSx (Pending) / 355 Tuned Port
Transmission: T56 Magnum (Pending) / T5
Axle/Gears: 3.42 / ?
Originally posted by joshp14
go to your local GM dealer and order one. the aluminum extension should run you about $20 and the screws are about $3 apiece, and you need 3 of them.
GM part numbers are 10108425 for the extension, and 14082425 for the screw(3x).
go to your local GM dealer and order one. the aluminum extension should run you about $20 and the screws are about $3 apiece, and you need 3 of them.
GM part numbers are 10108425 for the extension, and 14082425 for the screw(3x).
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