UMI Engine K Member
Senior Member


Joined: Apr 2016
Posts: 733
Likes: 47
Car: 1991 base firebird
Engine: tbi 305
Transmission: 700r4
Re: UMI Engine K Member
there is a guy on youtube named "Klowny69" who does a lot of thirdgen stuff. he installed one of these and shows it in detail. worth a watch.
Junior Member
Joined: Aug 2017
Posts: 39
Likes: 0
From: Virginia
Car: 1988 Camaro IROC Z
Engine: 427 Stroker
Transmission: 700 R4
Axle/Gears: Moser Street axles and 410 Yukon
Junior Member

Joined: Apr 2007
Posts: 98
Likes: 1
From: Nice FRANCE
Car: 1983 Recaro Edition T/A
Engine: ex-CFI 305
Transmission: TH-700
Axle/Gears: 2.73
Re: UMI Engine K Member
Hi
This is my turn to come in.
I'm thinking of buying one of these. In France, with shipping and taxes, you finally will pay twice (in Euro !) the MSRP price in USD. So should I really need one ?
My T-tops 1983 T/A has 70K miles, and will never be a daily-driver again. Just a pleasure car.
Our local roads are curvy and hilly, but our highways are great. For now, I'm running a prepped 305ci, but may switch to a 383 or LS-engine in a few years.
I want this car to behave like a Late-C4 or Mercedes SL : comfy cruiser than can compete Boxsters at the light, and run fast (120/150 mph) on Autobahns. No strip, no AutoX, no hard-cornering but a few Donuts here and there.
Here's the shopping-list : UMI K-member and A-arms on replacement WS6 springs, UMI torque arm/rear arms/SFCs, UMI Wonderbar, 15'' wheels and tires.
The difference between re-coating the factory K-member, and going tubular is $2000 to my wallet. So, I'm thinling twice.
What's you opinion ?
This is my turn to come in.
I'm thinking of buying one of these. In France, with shipping and taxes, you finally will pay twice (in Euro !) the MSRP price in USD. So should I really need one ?
My T-tops 1983 T/A has 70K miles, and will never be a daily-driver again. Just a pleasure car.
Our local roads are curvy and hilly, but our highways are great. For now, I'm running a prepped 305ci, but may switch to a 383 or LS-engine in a few years.
I want this car to behave like a Late-C4 or Mercedes SL : comfy cruiser than can compete Boxsters at the light, and run fast (120/150 mph) on Autobahns. No strip, no AutoX, no hard-cornering but a few Donuts here and there.
Here's the shopping-list : UMI K-member and A-arms on replacement WS6 springs, UMI torque arm/rear arms/SFCs, UMI Wonderbar, 15'' wheels and tires.
The difference between re-coating the factory K-member, and going tubular is $2000 to my wallet. So, I'm thinling twice.
What's you opinion ?
Joined: Aug 2006
Posts: 12,807
Likes: 108
From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: UMI Engine K Member
I would skip it unless you need it for clearance or you have already shed every last kilogram of weight and are looking for a little more. The stock piece is quite strong and the weight is down low which isnt a problem.
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: UMI Engine K Member
Yeah thats alot for kinda little gain. Theres like 30 lbs savings i think it was but thats hardly anything to get excited about
it does look nice and give more room around engine underneath but thats only an advantage if you need it for like header bolt access, turbo builds, spark plug changes if your headers suck, etc. stock K isnt bad to work around imo
if you want to liven up the handling get some koni shocks and but stiffer springs than factory
it does look nice and give more room around engine underneath but thats only an advantage if you need it for like header bolt access, turbo builds, spark plug changes if your headers suck, etc. stock K isnt bad to work around imo
if you want to liven up the handling get some koni shocks and but stiffer springs than factory
Junior Member

Joined: Apr 2007
Posts: 98
Likes: 1
From: Nice FRANCE
Car: 1983 Recaro Edition T/A
Engine: ex-CFI 305
Transmission: TH-700
Axle/Gears: 2.73
Re: UMI Engine K Member
Thanks for the great answers, I will follow your advices.
Firmer springs ? With factory height ?
For now, my shocks are 36 year-old. Understand : shot !!! I should buy the Konis, then check how the car behaves with stock WS6 springs.
Firmer springs ? With factory height ?
For now, my shocks are 36 year-old. Understand : shot !!! I should buy the Konis, then check how the car behaves with stock WS6 springs.
Joined: Mar 2001
Posts: 10,421
Likes: 2,083
Car: '89 Firebird
Engine: 7.0L
Transmission: T56
Re: UMI Engine K Member
Sounds like you want a car that gets a little rowdy and can show some other cars the tail lights. I like it, that's my style too.
A k-member in and of itself is not a good purchase. You should have some kind of greater reason for needing it, and I don't see that reason. Removing weight from low in the car (like a k-member) is the opposite of what you want to do for high speed stability.
I wouldn't be cruising at 120 - 150 mph on 15 inch tires.
A k-member in and of itself is not a good purchase. You should have some kind of greater reason for needing it, and I don't see that reason. Removing weight from low in the car (like a k-member) is the opposite of what you want to do for high speed stability.
I wouldn't be cruising at 120 - 150 mph on 15 inch tires.
Junior Member

Joined: Apr 2007
Posts: 98
Likes: 1
From: Nice FRANCE
Car: 1983 Recaro Edition T/A
Engine: ex-CFI 305
Transmission: TH-700
Axle/Gears: 2.73
Re: UMI Engine K Member
Thanks for all these great advices. So I'll just have the GM K-member removed and repainted.
Just in case, I'd rather buy new bolts before. No replacement part found on the internet, except at Spohn's site.
Just added them on my shopping-list !
Just in case, I'd rather buy new bolts before. No replacement part found on the internet, except at Spohn's site.
Just added them on my shopping-list !
Joined: Sep 2009
Posts: 3,776
Likes: 101
From: Spokane WA
Car: 92 Lingenfelter Z28 articwhite
Engine: Aluminum 615BBC
Transmission: Th400wbrake/curri entps9" locker
Axle/Gears: 4.11/4.30/4.56
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