I know you guys can let me know if it is normal. I have an 03 5At with only the Z-tube and pop charger. I changed the stock exhaust to an Invidia G-200 TD exhaust seven months ago and it feels like I lost a lot of low end torque and power but in the higher revs and top end speed I feel the gains. Before the exhaust change my launches were great and now they are just acceptable. Please chime in with a solution. I realy would like the low end back. I still have all the OEM exhaust and intake. Do I need to flash and what should I expect from the flash. I live near AAM in Maryland and they charge 450-500 for the flash.

Thanks for not flaming me
Nate