I just had K&N Typhoon intake installed few weeks back. Just last week had Belanger cat back exhaust system installed. First day Viper was very loud and had lot of fuel pop after letting of throttle. Check engine light came on in first 24 hours (Code 420 & 430). Had them reset and tone changed...
I have 2008 Street Serpent, coupe. Belanger exhaust system, K&N 69 Series Typhoon cold air intake and MGW short through shifter. Looking to upgrade PCM. Any input would be appreciated, part number and vendor? What upgrade would be best after PCM?
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