I am new to the site and have a 2005 9C1 police package Impala with 99k miles on it. I am unsure of the performance that it has. I can barely break the tires loose and my buddy has a 1995 bonneville with double the miles and he can stay right with me. According to GM the 9C1 Impalas have 3.29 gears and a standard LS Impala's have 3.05 gears. With that said I see plenty of Impala LS's and Grand Prix's just roast the tires! I did a 0-60 test and it's not impressive at all. Shouldn't my 9C1 be faster???
Also I would like to put dual exhaust on it and wondered if I should go with GMPP or an aftermarket set up? Which would be better and cost effective?
Thanks
