Even with the added boost, he won't hang. I seriously doubt he's smoking Z-28's & Mustang GT's. Just go take him. If by some chance you lose, well that's the chance you take. I would be hesitant to run more boost on your setup without and fuel boosting mods. Would the exhaust you mentioned go all the way up to the front? You could just drop off your mufflers for a couple of days for free. Run him!