When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Mine is 4", I'd assume 5" would make a little more power I need to ask Capiz about that the next time we chat. But my exhaust is also pretty short, maybe 3.5 feet at the most?
Like PSJ said, you might be losing a little at that power level. My mustang had a 402ci with a F.I. billet 85/102 that was mounted on the drivers-side frame rail with an immediate 5" to 4" transition and 2 45* bends to a pass-side fender exit. 8.092 @ 169.78 with 3300# and Wallace spits out ~1,100rwhp, for what that's worth. Maybe I was leaving power on the table but it certainly wasn't restrictive as i ended up dragging the parachute at the 60' when I turned up the boost.
Since this is a street car, going 5" will depend on how much noise you and neighbors can tolerate, how much room is in the engine bay, how the turbo is positioned and can you swallow the price of 5" SS or 11g aluminum bends. E.g., trying to do a 5" fender exit with a turbo positioned front to back is like making an 18-wheeler do a u-turn on a 2-lane road.
Like PSJ said, you might be losing a little at that power level. My mustang had a 402ci with a F.I. billet 85/102 that was mounted on the drivers-side frame rail with an immediate 5" to 4" transition and 2 45* bends to a pass-side fender exit. 8.092 @ 169.78 with 3300# and Wallace spits out ~1,100rwhp, for what that's worth. Maybe I was leaving power on the table but it certainly wasn't restrictive as i ended up dragging the parachute at the 60' when I turned up the boost.
Since this is a street car, going 5" will depend on how much noise you and neighbors can tolerate, how much room is in the engine bay, how the turbo is positioned and can you swallow the price of 5" SS or 11g aluminum bends. E.g., trying to do a 5" fender exit with a turbo positioned front to back is like making an 18-wheeler do a u-turn on a 2-lane road.
Thanks for the info. I took a quick look, and I did not realize how expensive 5" stainless is. I guess some of this might be N/A thinking where you are always looking for every little restriction and HP. The turbos make so much power, unless you are class racing, leaving a few on the table really is not a big deal. Although, I will say the 5" exhaust looks nice.
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.
Thoughts on 4" vs 5" Downpipe 
