Good channel on YT for custom designed exhaust systems and tuning. They had a preview for a 3rdgen in 2026, and today was the video release. Most likely a TGO member's car.

 

All it needed was a 3.5 single and better muffler. Just sayin'

Anti-seize is your friend with slip joints.

That wavy power curve from the initial dyno was the tune.

 

This is like the magazine articles back in the day where they did a MSD cap and rotor button with MSD plugs and wires, a MSD coil, and a MSD box on a LB9 and gained 22hp over stock but the stock LB9 needed a new cap and rotor button along with new plugs and wires, and a new coil because the stock OEM parts were worn out to begin with.

The test car in the article would have gained back the 17hp it had lost due to worn out OEM parts with new replacement OEM parts. The MSD crap would have only gained 5hp but a 5hp gain doesn't look impressive on the cover of the magazine.

This car should have had its mechanical problems fixed and OJ properly dyno tune it before the exhaust system changes then have OJ properly dyno tune it after his new exhaust system was installed. This would have showed the true power gains from his new exhaust system.

I'm sure there were power gains from a properly tuned Borla exhaust system baseline and his new exhaust system with a proper tune. Just not as much power gain as was shown in the video here.

Nothing against OJ and FMU. I like OJ and subscribe to FMU's YouTube page. Truth be told I don't imagine dude paid OJ to fix and tune the car wit the Borla exhaust system in place to get a proper baseline to start with either.

 

I agree, while watching the video I wish OJ wouldve cleaned up the tune first and see what the car did before any other modifications for a true baseline. This creates a bias knowing that the exhaust gains are not solely from his improvements. The customer more than likely wanted fine tune and slightly cleaner sound, dyno/tune time isnt cheap and I bet the shop time for getting a baseline is negotiated to be featured on youtube.

Overall Im not sure I quite like the sound afterwards. Its not bad by any means, but I think the camera mic is throwing off how good it probably is in person. The workmanship though is great! His insight to making the most of of a chassis with performance in mind is great to see and learn from. People think these cars should be easy to make an exhaust for and now quickly realize, its pretty tight and ground clearance can be a real bitch.

 

Is going through all the trouble of running true duals and ending into one muffler really worth the cost and effort?

 

I'd love to see what that bill was compared to the what it cost for his previous exhaust.

I don't think it was worth it over just re-tuning the car and addressing any other mechanical problems. If the car had oem manifolds or was a fresh build and I could have OJ build me an exhaust and a final tune at that point I'd be more inclined.

 

I saw the video clip on Youtube last night, then this thread today. The old exhaust was absolutely the cause of the wavy power curve. Just had an exhaust that was overly restrictive at the muffler doing the same thing. Even the raw mass air flow sensor data was wavy and it sounded like an old Hoover with a full bag at WOT. That exhaust is definitely visually impressive and sounds great. I like that it is valved as well. That being said a dual 3" to single 4" merge Y system likely would have made even more power than the dual 3" system. The old Y-merge was horrendously bad and the 3" single pipe was choking that 6.2L much the same as a dual 3" inlet Walker Quiet Flow was choking my 383. I went right up against the outlet of my 3" high flow cats, added this Howe Y-pipe behind it and immediately into a 4" core 30" long AP truck muffler and 4" tailpipe. Runs far better and sounds better as well. I knocked over a full second of my 0-60 in an undergeared, 7,000 lbs brick before even touching the PCM tune.


I have also seen the results of changing out only the Y-pipe on a Ford V10. The factory Y-pipe dyno curve looks like a 8.0 earthquake. After the Y-pipe is replaced it is far smoother, the power is significantly increased across the whole RPM range and the weird dips and valleys are eliminated from the curve. If you are going to run a single exhaust it better have a nice smooth transition, an adequately sized pipe and a muffler that flows enough CFM for the power being made.