Going with what everyone else here is saying, you could very well match or beat a GT with a well thoughtout F/I approach. But it's gonna cost probably $4-5k on the F/I alone.I got a 2007 mustang rag top V6, however I want more power. Is an engine swap possible and if is what engine can used?
Carefull on your wording I dropped a 351 windsor into my 83 notch...it was a 4 banger , for $2000.00 engine included....now I know your comment was aimed at newer fuel injected computer controlled cars...just had to say it Regency.It's stupid to try to put a v8 in a v6 car, with the money it would take to do it you could sell your v6 and get a GT
I would either:
1. sell your car and get a GT
2. supercharge or turbo charge your v6
+1On another forum Buckman got 11.0 in the quarter and Rygen 10.90 by turbocharging their 4.0 V6s. They used either a 67mm or 70mm, both from Powerhouse, where I got mine. I'm sure many many other mods were done as well but shows what can be achieved with a 4.0 without an engine swap.