Aside from a few minor modifications, installing a Pro-Flo XT manifold on a C4 is a refreshingly straightforward job, especially when compared with the notoriously tedious SuperRam install. With regard to price, a used SuperRam can be had for $800-$1,200. Provided it seals well, you can reuse your fuel rails and injectors, purchase a larger throttle body for $250 to $350, and end up with a total cost of $1,050 to $1,550. The Pro-Flo XT and all ancillary hardware, meanwhile, will run between $1,200 and $1,400 brand-new, depending on how you route your fuel lines and whether you have to buy a new distributor.
Based on our experience, it's clear that the Pro-Flo XT represents an exciting new option for any TPI-Corvette owner hoping to maximize the power of the L98. It looks mean and makes great power over a broad rpm range, even before it's been cleaned up and port-matched. In the case of our '86 C4, the Pro-Flo XT has found a permanent home.
Special thanks to Duke Langley, Scott Rewinkel, Robert Carosino, and Reagan Carosino.