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The GReddy is a little better. I have seen the Greddy core work fine during hot dyno sessions up to the 320-340rwhp level. For extended track usage, I would not recommend the eBay cores above 250rwhp and the Greddy cores above 300rwhp. For street use, another 50rwhp should be fine on these unless you live in a very hot place. As far as sidemounts go, the Turbohoses Stage 9 appears capable of supporting 350rwhp track and 400rwhp street. Beyond that, it's trunk mount or A2W and these are all pretty much custom so their capabilities are all over the map. I've seen very poor A2W setups that aren't much better than a Greddy sidemount and I've seen some that seem to take as many fourth gear pulls at 400rwhp as you want to throw at them without a hint of heatsoak.
Mid-engine cars are in general screwed when it comes to intercooling. Massive amounts of cool air flow in the rear is much harder to come by than in the front and A2W adds the second heat-exchanger stage for which you must pay a penalty.
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