I do believe (I could be not remembering correctly, but I'm pretty sure, I was doing research for another customer who was looking at different exhaust options) that there's a video that compares a Z06 Ti exhaust to an aftermarket one in a couple of different situations including idle and WOT.

If you'd like me to look up that set of PMs for you, just send me one and I'll dig them out for you.

The only thing is - I wonder how expensive it's gonna be to get a whole catback overseas? We ship to the US and Canada, but unfortunately not England . (Wish I could help you out, but unfortunately not at this time). Also, you might find it hard to buy a new catback from a vendor on the forum, versus buying a used Z06 exhaust from a private seller.... (who will probably be willing to work with you to get it "across the pond" as they say ).

If you're looking for sheer aggressive muscle-car sound, imo you can't get much more aggressive than an SLP Loudmouth. Not for everyone for sure, but it will turn heads. You'll gain a few HP too.

However, I have to say I wouldn't do a catback and then do headers - if you find a catback you like the sound of, then put on headers, you could get a sound that's too loud or not what you like .... however if you do headers and it's just not aggressive enough for you, you can always get a catback. (That's if you think you're going to want headers, and as someone else mentioned, they a more involved and expensive installation process.) You can always do more, but it's kind of hard to undo, you know?

Just my 2 cents.

Good luck!

 

Also, LG headers are a pretty popular mod, it shouldn't be too hard to find video of those combined with a few different catbacks to give you an idea of what they'll sound like installed.

 

YouTube has plenty of those videos.