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Here's an idea from VOI X that looks good on this Viper.
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I installed Unitrax titanium driveshafts and d-shaft loops. I have a set of 800hp Unitrax Axles 4 sale if you're interested.
I suggest installing a Passport ****** 9500ci radar detector as my choice of modifications. I have an SRX ($850) and didn't bother to upgrade to the new GPS unit as it's nearly $2,000. Main advantage over SRX is that the GPS unit downloads speed camera locations from the internet (for California and a couple other states. Here in speed cameras are illegal.
You already installed HIDs??? Huge difference.
Smooth tubes? Mine are 90 degree Sapphire alum. elbows into my M2 dual cone airbox. The rubber connectors (Roeracing TBs to aluminium tubes) are great for mounting the water/**** injectors, but the Nitrous fogger nozzles are mounted in the aluminium tubes.
Ted