Difference between 18cm & 21cm Housings

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Hey Guys:
I still have my stock turbo on there, just wondering if there's a way to tell just by looking at the outside of it which it is... mine is a 1993 d250. . production date of 11/92... . it's either the 21 or the 18cm housing right?--it spools up pretty quick with my 4-inch exhaust.

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Greg's 1993 D250 4x2. . 5-speed. . extended cab. . longbed. . bright white. . tinted windows. . 4-inch pipe no muffler. . K&N air filter. . 139,000 miles. Tweaked pump. {thanks Piers}. "The Phantom"

 

[Archive]

According to Dave Fritz's website the 93's came with the 18cm2 http://www.dodgeram.com/index.html

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92-LE,Cummins,Tach,4x4,5spd,3. 54,Borgeson steering shaft,

 

[Archive]

Yeah, I had my '93 with the 18 tuned in pretty good @ 30 psi!... ... then I got the 12cm² #ad
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• '93 250 LE 4x4 5spd 4:10 Loaded,dual 5" chrome stacks,12cm² turbo,PW injectors,K&N,pyro/boost,US Gear E-Brake,tool box,CB,10" AR rims, 285/75/16 Bf goodrich. "wirenut_21529" on Yahoo Messenger
• '96 Ford B-Series school bus (5. 9 Cummins!)I'm gonna Bomb it!
• '94 GMC 2500 6. 5L Turbo

PICTURES.