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i just bought a 135 but there is no exhaust system installed , just a straight pipe from the engine going all the way to the rear of the car. i am experiencing a lag in the RPM is taking long time to go high no matter how hard i push the gas pedal. and even on acceleration i am feeling that the car is not at its highest performance (knowing that i have a JB4 installed on the car). does anyone else has this problem ? or should i install an exhaust system?
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