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yeah the e55's are nasty cars that car just had basic cooling and some weight reduction the exhaust mods doesn't really do anything besides the weight the big restriction in the exhaust is the headers. the e55's with right around 5k can get you:
Tune
Pulley
Cooling mods
Fuel Rail & Injectors (once they start getting real modded cylinder #8 leans out)
bigger throttle body
headers
all of this would put the e55 at around 550-575 rwhp
and 1/4 mile times and et's faster than any 335i
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