Need some help on suspension modifications please.

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Agree with Thstone. On a limited budget leave the suspension alone and run stock class. Mount the freshest tires that are competitive in your class, get a performance alignment to make the most of your contact patch, and get a top driver in your right seat for coaching. "Tuner" suspension changes will make no difference in lap times at this point. Always tighten the loose spacer behind the steering wheel before making changes to the car.