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Well after getting my problem figured out I finally got to run the straight pipe I made for my 2015 viper mtx 190 mpi turbo. The sled was weighted a bit heavy when I got it but now it spins 8600 rpm perfectly and boost comes in fast. Runs actually better than it did before the straight pipe. It is a little loud and annoying on the trail but ok while playing. It does bounce of the rev limiter once on take off. Over all pretty happy.