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Factory system flows pretty good for the factory specs. Not sure of the 1.8, but the 1.4T pre cat clinging onto the turbo was the choke point. There are a few YouTube videos(blocked on this computer) that have 1.8 deleting that last muffler leaving the mid pipe one in placas as well and ditching them both. The mid pipe one usually does the most NVH sound cancelation so deleting the rear one usually give you decent but bearable sound levels on "most cars" out there.well i found out i can fit somewhat under the car, first off factory muffler looks like it will choke the engine, exhaust goes in, gets sent though the muffler and back out the same side. i didnt have a my tape measure, so i couldnt get exact size and length but got a rough measure using my galaxy s4 (phone) i found out it took 3 and a half. and came up with 18.76" long width i dont know. now the muffler i got may fit in that hole over all is 19". if so thats great due to that would mean less figuring on how to route it. but lack of supports there.