^ doubtful, if that was the case why would all the high power K-series in Australia and the states be using straight through 3" exhausts with a single outlet?

I'm talking about cars making anywhere from 200whp with simple bolt ons and tuning all the way up to cars with 340whp (All NA). They all run single outlet exhausts. There are no k-swapped cars making more power with a dual outlet exhaust. Surely if there was an advantage the workshops and private tuners in the states and Australia would have started using such a setup. Call me a skeptic but I'm just not convinced that a psuedo dual outlet exhuast can provide any benifit on a 4 cylinder car compared to a well designed single outlet. Why would companies like FEELS, J's Racing, Spoon, Amuse all offer a single outlet exhaust as their "high power" model. None of the dual exhausts on the market that I've seen tested have shown more than a 2-3whp gain.

I'll be having my car tuned with a standalone ecu soon, so it'll be interesting to see what sort of gains I can achieve with the single outlet setup.