The gun shop I think you are talking about is in Hoboken. Drive across the Gilliano birdge (towards Hoboken) go straight until you reach the alley with many dips. Slowly go down and take a right. You should see a sign that says 'Twisters' and the gun shop is in the parking lot to the left, through the silver door.
In the campaign, you can only go to the gun shop in two levels.
And be more specific with the race. If it is the campaign race, I could help, if it is the sidequest race, I only played that once.
[Edited by lewis rfc, 2/1/2007 11:34:56 AM]
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