True duels with straight will be pretty loud!! It should sound bad a$$ though. I would definately get the X-Pipe with your true duels. It will sound better.

I agree the X-Pipe will make it little more quiet but the tone is better and it's more even. I know for a fact mine was not as loud after i added the X-Pipe.
Also i am pretty sure on your 2000 the pipe is 2 1/4 if he cuts it at the factory Y-Pipe. Cheack my gallery for pics.
You need to decide if you want true duels or just take the muffler off.

 

I got it done, true duals no mufflers, looks good and sounds a lot better. Feel good drowning out a acura with a fart can on it at a light

 

do u have a 4.6 or 5.4?what size did he run? what are your impressions on the tq level now -phil

 

That is one thing I forgot to ask I'll have to go look if its 2 1/4 or 2 1/2. Now from where the muffler would be back is 2 1/2 stainless from my magnaflow catback I had on there. As for power it still jumps from the start and I've always been impressed with the power from the 5.4L

 

the affordable route to go, cut the muffler out & run tips if you want, louder way to go, true dual with and H pipe.

 

I have single out 3" straight pipe from the stock y-pipe and stock cats. I love it. Loud and sounds great. I did have si/so magnflow before, and i thought it was waaay too quiet.

 

I cut out my huge stock muffler today. love the new sound for free. this will do till the money is right for true duals and an off road h