Wait 500-1000 miles for the Milltek to full break in, when I first got it I thought it was a little too quiet and tame but it has grown not necessarily louder, but more aggressive sounding.Ok, so I ended up buying the Milltek Catback from LiC Motorsports. Was a pleasure dealing with them and the price wasn't "as horrendous" as elsewhere. Including shipping I probably saved over $400 versus local options. Sold my Corsa to offset some of the cost.
Mind you I'm still suffering from an injured shoulder from doing the install... my chest does NOT fit under the car near the downpipe even when the rear wheels are up on ramps so I had to hyper extend my arms to take the bolts off and put them and the new gasket back on. I recommend a friend so you don't have to hold things up with one hand and torque things with the other.
The Milltek is very high quality overall. It is visually appealing and appears to be constructed well. Cold starts are back to stock volume levels - SIGNIFICANTLY below the volume of both the SPT and the Corsa (My car doesn't rattle windows in the house any more). While cruising, it sounds nice but with subdued volume. It has absolutely zero drone across the entire RPM range.
Apparently I have an EWG as well... I wasn't aware that I did when I had the Corsa on... the Corsa sort of drowned that out. I actually /like/ my EWG now. That's only loud when I really intentionally step on it... and my EWG at 21 PSI is quieter than me attempting to pull up the hill at the end of my street at 25 mph at 6 in the morning with the Corsa on... The local constabulary have now deemed me beneath their notice one again.
If you are looking for an exhaust for your sleeper or family car or you're looking to tame in the volume, I'd highly recommend the Milltek. If you want to hear one in person and you're near Central NJ, I'll be more than glad to meet up.
Most people think that a louder exhaust is automatically more sporty or aggressive, and I guess the Subaru crowd has a huge tolerance for loudness as evidenced by the very positive reception of the Corsa exhaust. Sheesh, if drowning out an EWG which is one of the loudest exhaust mods you could possibly make to your car is not a sign of a really loud exhaust, I don't know what is!
But at any rate at a recent autocross there were a few Subarus with different exhausts, including a Perrin, the normal Invidia, Nameless etc. Surprisingly you are seeing more and more ELH cars as well. At any rate all of these cars were a lot louder than the Milltek by a significant margin, yet the Milltek to both me and another experienced Subaru modder and driving instructor was a lot more aggressive.
Yes opinions are like assholes, everybody's got one etc etc etc. People think, just like wine "if I like it then it must be good", but there is an objective way to evaluate things that you may like or dislike. In wine for example you take the complexity of the flavor, how harmonious it is, and above all how complex and long the finish lasts. This last element is probably the most accurate at guiding quality and deciding price. And taking it from an objective point of view, most of these other Subaru exhausts like the Corsa make it seem more fun by cranking it up to 11. But they are not harmonious. It's like hearing a lot of musical instruments all playing at the same time, or in a room full of people shouting, sure, there's your tonality. You hear every pitch of possible sound booming at you at 11/10. Fun for some but cacophonic over harmonious. If you drive long enough in the car, you will damage your hearing and I can confirm this because the Corsa made my ears ring, not to mention the already discussed windows vibraing, 100+dB starts, angry wife, waking up your children, pissed off neighbors, noise violations, failing inspection etc etc etc.
The Milltek takes a different approach, it is very thoroughly engineered to hold up to any mod set from mild to wild, yet provide a harmonious and exotic sound. Rather than just blanket screaming and turning up the volume and the distortion to 11 on everything, it really is very musical, refined sounding, more like a German type car. So it relies on refinement, not just reducing packing (which is also a cheap way to save money by the builder).
Sadly it is expensive, but you get what you pay for. The real tragedy is that the Corsa whose workmanship is far less refined, doesn't fit that well together costs the same.
List price for both these exhausts is north of 1000 dollars, but the difference is they sell lots of Corsas (and Perrins and Invidias and Nameless and Greddy and Cobb though the latter isn't bad). Each Milltek is more or less made to order and you have to pay for the shipping of the individual unit instead of a whole container's worth coming over. But when you compare list price to list price, the Milltek is just so much more substanital, thicker, well put together than at least the Corsa (which felt cheap and tinny) or any other exhaust in this price range. But it doesn't sell enough to get any cheaper than list price which is too bad, because even at "list price" it represents a wonderful value considering the workmanship and refinement.