I don't know, these cars might react different. I use the stock mufflers too. Remember, i'm still on 20 inch wheels with the different gearing so that could be the issue. I don't focus too much on dyno numbers like I do ET/MPH.
I've been after that 9 second pass for a month or two and finally made it happen this last weekend at a rental we had here in Palm Beach.
It's a 2015 base S550 with:
SP Headers catless
Circle D 3C
Sai Li Fuel system with e85 and id1000's
Lund tuned and built by Lujan...
thanks! I have a JT making close to 12 lbs, 93 octane, Lund tune, circle d 3c converter, sp headers, lethal x pipe, stock exhaust and roll on 20 inch velgen wheels with 555r tires. Car is lowered on sportline springs. Other than that, she's all stock. oh and a Jms bap. All installed by the...