what kind of gain can i expect to see switching from stock headers, mac o/r h and flowmaster to bbk 1 5/8" long tubes, bbk o/r h and either my flows or mac pro dumps???
It will be a noticable gain since your engine combo could sure use a good set of header's instead of those stocker's which aren't bad for a stock engine but a restriction on an engine like yours. Possibly a 20+HP gain could be in the work's with both the header and exhaust install.
You will see a difference no matter what, definetly more then what a stock engine would see in gain's as your combo is more in need of a good header/exhaust set up.
It will definatly help. I have BBK LT's 1 5/8ths into thier 2 1/2 H pipe into 2 chamber delta Flowmasters with no tailpipes. I did heads and all first also. The sound difference with longtubes alone make them worth it. It's not much louder cruising or at idel as it was with stock headers and stock H pipe, but when you open it up especailly above 4K rmp, wow. Yes you will gain some horsies, not to mention the mid range tq.
So has anyone here actually replaced their starter with long tubes? I only ask because it looks impossible on mine without actually removing the passenger side header.
Ha! Starter removal, I'm lucky to get the friggin things in with the T56. For future reference, lay them in BEFORE you drop in the motor. I have to pull them to replace the clutch too. FUN!
yeah i have the same 2 1/2" bbk o/r h pipe too... i cant decide weither to use the mac dumps that came with it, or my flowmasters... i guess ill just put both on an see which one i like better...