i have a sirio evo 4 sti. i run a 2013 pipe set. it has great bottom to top. it is perfect for truggy. My buggy hot bodies d8 is very heavy and moves it well. I think the 2056 big boy will give u better milage ,but u will lose low end.I get about 8.30 min on a 8 mm insert on a very big track with a 200 foot straight.the 2013 sound cool also.