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370whp/420rwtq on a "heart breaker" mustang dyno. Its a 30whp bump over what it was and it feels great.
The tuner says it has quite a bit more left in it but there is, essentially, a load limiting table that he doesn't have access to. He'll get in touch with Cobb and I'll be back down to get a free retune.
Those bushings are definitely F'd,but I don't know if that's the cause of your tire wear.Those tire pics look to be almost evenly worn all the way across the tread,so it doesn't look like toe change is doing it(and the worn RTA bushings won't result in much,if any toe change under normal driving).Is the rear wearing tires much faster than the front?
Your bushings look to be rotted pretty good,so I'm sure that's the main factor in them failing,but if you clock the new ones slightly off level it'll account for the car being lowered(and the much altered from stock angle of the trailing arm),and put the bushing in less of a bind.