Who's car is this?

[bawazir]

Who's car is this?
& doing this setup do you need to re-dyno the car?
he basiclly got 2 cats vs 4
http://www.mustangandfords.com/techarticles/mdmp_0904_2003_mercury_maraude r_exhaust_install/photo_04.html

[musclemerc]

Old tread alert! The guy in the last pic is the owner and IIRC the shop is in Canada. But there's some good info there for you guys doing muffler swaps and rear cat deletes. The mid pipe is the area needing the attention! Even with crush bent pipe it's the right way to go.

[MrBluGruv]

I've heard a lot of mention of the midpipe being upgraded for performance gains, and for all the exhaust mods I know of, I really don't understand how it makes that much of a difference.

Would someone mind elaborating a bit about this whole midpipe thing? Like specifically, where is the poor design component that gets a boost when you swap for something different like a x-pipe?

[musclemerc]

The stock midpipe has 4 cats, the o2 sensors are too close to the cats, and it starts at 2.5" and drops down to 1-7/8" well before the H pipe. Thats the loss. Cutting cats just makes noise and adding muffler does the same. The swap will only help you if you replace the entire section all the way back to the mufflers.

[bawazir]

Just wondering if running headers with S/C, 2 cats, can you still stay with H pipe,
is this true:
H pipe = TRQ

&

X pipe = HP

I rather keep my H pipe, but would that be good with headers ?

[musclemerc]

There's one other. Pro Chamber
If your going with headers then get a custom 2.5" H pipe made

[MrBluGruv]

The stock midpipe has 4 cats, the o2 sensors are too close to the cats, and it starts at 2.5" and drops down to 1-7/8" well before the H pipe. Thats the loss. Cutting cats just makes noise and adding muffler does the same. The swap will only help you if you replace the entire section all the way back to the mufflers.

I just totally misunderstood mid-pipe didn't I? :P I'm not thinking very clearly tonight.

I wasn't aware the exhaust system as a whole dropped diameter THAT much. I assume the 2.5" is the collector side of the manifolds? I'm probably going to be doing some exhaust work this summer, maybe I'll get a full 2.5" fabbed up. Only problem I think I'll have then is I'm pretty sure the muffler inlet and outlet diameter are much smaller than that, so there will still be a choke point there. :(

[musclemerc]

Yes at the flange it is indeed 2.5" after the trans crossmember it goes down to 1-7/8" . After the stock mufflers it's 2-1/4" so from there it's OK. The write up Abdull posted pushed me to do the swap and add the JBA shorty's with the 2.5" pro chamber.

[MrBluGruv]

I think my mufflers are 2.25 in and out, so if I had a full 2.5" system fabbed up to that point I imagine I wouldn't have that much more restriction, at least not enough to notice a difference compared to doing the rest as 2.5" and not stock. Of course all this will probably equal a decent drop of $$$ because I'll want to put back on at least a pair of hi-flow cats and I'm really considering electric cutouts...

[musclemerc]

Do the mid section and be done with it. The welder can slip a piece of 2.5" over that muffler inlet and seal it no problem. Leave the rest and save the money for something else. As far as the cut out's go, why? All your gonna do is make noise and be alot slower. There's nothing worse than a loud slow car, get a SC if that's your plan

[LeoVampire]

They would have gained a lot more by doing away with the stock manifolds and putting the headers in as well.

They are just as guilty as the 4 cat system set up in a big loss of flow these engines enjoy to run stronger.

Shorty's or long tubes anything is better than the stock manifolds.

[bawazir]

Dose anyone know what part # those cats are?


http://www.mercurymarauder.net/gallery/data/500/medium/cats_magna_magna.jpg (http://javascript<b></b>:;)