Mods are: K&N in stock air box w/Ram air kit, and Borla Stinger Cat-Back. Is the stock 4 cat H pipe the cause? The ram air kit has a BIG scoop that fits under the RF bumper and I would think the car would get a big kick at high speeds!? could it be throwing off the MAM?? Cuz I mean at 115MPH it has to be ramming A LOT of air in the air box! I bet it's the cats. Bastards! :bash: