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ngc414 08-27-2007 08:36 AM

Ways to verify a true GNX?
Are there any ways to verify a car is a true GNX and not a clone? What are the differnces?

Keller 08-28-2007 11:39 AM

Re: Ways to verify a true GNX?
Definitely. First, you can check with Rob Wilson. He runs a registry of all 547 cars that were built as GNX's. See his page at

Also, see

The body plate under the hood will have "GNX" stamped on it, and the RPO sticker will have code "T2L" listed.

Plus, there are some clear differences would be very difficult and/or expensive to duplicate. At least 100% correctly.

* Ceramic turbine wheel turbocharger to improve boost response - may be impossible to get replacement wheels for. Many owners remove this turbo and put an upgrade replacement on so as not to risk damaging it.

* CERMATEL (Ceramic/Aluminum) coating applied to the pipe between the intercooler and throttle body and distinctive GNX turbocharger cover to reject underhood heat

* High efficiency intercooler - higher fin count (ala Turbo Trans Am) and labeled specifically for GNX.

* Recalibrated PROM (computer chip) to maximize the advantages of the ceramic turbine

* Auxiliary transmission cooler

* The rear suspension was modified by removing the upper control arms and installing ladder bar, a panhard bar, a cast aluminum rear cover and frame cross brace was added to add an anchor point for the ladder bar. Now reproduced by Dennis Kirban. (

* Transmission - "NEW" cushion servo, pressure spring, first-second gear accumulator bushing and valve, third-fourth gear accumulator spring.

* Free-flow dual exhaust - supposedly just an Olds 442 exhaust. This was needed to fit with the GNX suspension and likely flows better.

* 16 inch aluminum alloy wheels with Goodyear Eagle VR "Gatorback" radial tires (245/50VR-16 front & 255/50VR-16 rear). These are NOT Trans Am wheels. Specific to this application.

* Additional rear seat brace

* Body bushing #5 added

* Full analog instrumentation including tachometer, speedometer, turbo-boost, coolant temperature, oil pressure and fuel level gauges by Stewart Warner. Some leftovers were being sold a few years back, but these are likely gone by now.

* Modified wheel openings with fender flares to accommodate the larger wheels and tires

* Functional front fender air exhausts to improve intercooler radiator airflow

* No badges on the hood bulge. GNX badges on the grille and trunk. Serialized # (001-547) on the dash panel. The number plates were available from GM Parts, and some bought them to try to make money reselling them.

kenmosher 08-29-2007 09:34 AM

Re: Ways to verify a true GNX?
To add, it'd be odd if they didn't have the ASC McLaren window sticker and the associated GNX book that came with the car ...

Keller 08-29-2007 11:08 AM

Re: Ways to verify a true GNX?
Not to mention the jacket that came with every car, too.

GNXRegistry 11-02-2007 02:08 PM

Re: Ways to verify a true GNX?

I can verify a GNX VIN and provide additional GNX-specific data, including original block and turbo serial numbers, selling dealer, and build date. Also a history of the cars we have in the Registry, excluding any non-public pricing information.

It may take a few days to a week since we have many inquiries, but just wanted to let you know we're here and have been doing this for some time. Also have devised a simple "one finger, one second" check for the original GNX turbocharger with no removal of any bolts, no mirrors, no crawling under the car, etc.

Feel free to PM me if you need any guidance or further information about a particular car (or would like to register a GNX yourself).


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