Join Date: Apr 2007
Location: Gunnison, CO
Bronco Info: 78 XLT, 429 Thunderjet, C6, sh ackle flip in rear, 4" springs in front, 4.56 gears, f& r trac loc
The SP2P will make slightly more power, off idle, with better response, at lower rpm, but will run out of breath, before the Performer. If your rig is stock, and you never push hard, you will not notice much of a difference between the 2. When the SP first came out, it was presented as more of an "economy" intake, than a power maker. Back in the day, guys were running the SP, with a tiny Holley "Economaster" carb, and wondering where all their get up and go went!