How about a real THDP..3.5". email me direct at JQN555@live.com
This is the way I see it I have to be honest.
I like the RJC racing down pipe 3 inch internal wastegate .sells for right around 450 if I remember correctly.
In My eye if the price is anywhere near that I’d rather just pass and get a new one.
I’ll send you a pm and you can tell me