Originally Posted by Youngfrankenstein
Getting the long tube & real tune bug. On page 8 of this thread, the OBX’s are kind close to the JBA’s. Were the OBX’s results w/2.5” exhaust and the JBA’s with 3”? Or were both with 3”?
Obx can only use 2.5” exhaust. They gained 41hp and 73tq to the rear wheels over stock.
The jba reduced et by .9 where the obx reduced it by .4