You won't screw up the odo if you do a -1 or -2 application. Any good tire shop or online retailer should be able to give you the right tire size to maintain the proper rolling circumfrence for your application. If you can't find anyone let me know as I have written a spreadsheet (but it is in the much un-used Lotus) that will compare five different sizes to the stock size and return the difference in rolling circumfrence in inches and if you know your gear ratios (trans and final drive) it will estimate land speed or engine RPM depending on the info you input.
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 '03 Inferno Red GT, 5 speed, STAGE 1, Mopar BOV, Plastic Intake, Modified Upper and Lower Airbox, Custom Airbox-to-turbo pipe, Borla dual exhaust, Maddog Short Shifter, Drilled/Slotter Rotors, Ceramic Pads, chrome wheels, chrome door spears, AMP chrome fuel door, PT Cruiser 3rd light diffuser, H&R Springs, Rear Sway Bar added, MGW chrome door lock pulls, Blane's hood struts, Custom license plate mount, some interior dress up stuff...more to come
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