In some ways they're on par, like in detail and headstage, and not quite as good in others. They're close, just not as well-rounded in sound sig, lacking bass extension. However, they're half the weight and feel more comfortable. Mids and treble are great. I could stand using them every day, especially in places where I need a closed set of cans. These are definitely going in my travel bag for long flights.
We did much worse to mine, in terms of boost. We've had it near 840hp (8psi), at the wheels running E85. But yeah, there's no way I'd let that crooked, cheapskate hack near an expensive any car. You don't just throw on a couple turbos and off the shelf parts and call it a day, the intercooler he uses for that is a joke, about 1/2 the exchange rate as ours, and they don't even bother retuning the suspension or brake bias. They also don't bypass the factory ECU, they "ghetto flash" the original, leaving you up s*** creek if you have an issue with it.
I think they feel quite "trim", but I'm used to wearing orthos a lot, and those aren't very light. They're more svelte than the Fostex TH900/600s.
ahh thanks for elaborating on what he did! And adding turbos without retuning the supesion... I think I'm smart enough to know not to do that >.>