Prochamber question

[ElCid2006]

Is anyone using the Mac 2.5" Prochamber direct fit to stock cats (p/n PC2105) with Flowmasters? I am looking at buying this setup and am looking for opinions. Thanks.

http://www.macperformance.com/store/category.cfm?SID=3&Category_ID=938

 

[300bhp/ton]

I've not seen this setup but I've always been very impressed with what I've seen on the sn95 Stangs. Also in the Fbody camp a chamber design has proven to be more efficent than either H or X pipes in tests when correctly configured.

If you're after performance though, I'd probably consider replacing the CATS for high flow units and swapping the headers for something a little more performance orientated:

- Longtubes for n/a
- Shorties or long tubes for forced induction (shorties cheaper option)

EDIT:

One of the best sounding Stangs I've heard was a 4.6 sn95 running shorties, ProChamber and a SLP LM

 

[kooldawg6]

Unless you absolutely need to leave your cats in place for emissions, replacing them with high flow cats is near a waste of money if you're not going after sound. The stock cats flow really well. The shop I deal with said it is a waste of money for a power benefit.

 

[V8JamesGT]

I want to hear a setup with Mac Long Tubes, off road prochamber and either flows or pypes mid muffles... This is what I'm thinking of doing...

 

[300bhp/ton]

Unless you absolutely need to leave your cats in place for emissions, replacing them with high flow cats is near a waste of money if you're not going after sound. The stock cats flow really well. The shop I deal with said it is a waste of money for a power benefit.

I'll be honest I don't know anything about the OEM cats on the s197's. However I'd be suprised if they do flow great. Most OEM ones don't, not even close.

OEM then to be ceramic core CATS which can flow ok if they are 3" inlet/outlet with a suitable core size, but these will still be restrictive on higher HP setups.

I think Random Technology ceramic core CATS get to about 380-450cfm flow rate. Ideally you need 2.2cfm per 1HP for optimum HP.

That means each cat can support 200bhp (remember only half the engine and half the HP goes thru one cat on a Stang). So these would work ok on a n/a or mild FI setup but be restricitve on anything more potent.

These are pretty much as good as ceramic CATS get. OEM aren't even close and are probably only 2" inlet/outlet.

Metal Maxtrix core cats are the answer on high HP can support well over 500bhp without restricting flow. But they cost a lot to buy.

Hope this helps

 

[scupking]

High flow cats will make a difference over OEM. Also out of cruiosity how many cats are on the S197s. I know 1994-1998 stangs had 6, 99-04 had 4 and mine has 2

 

[kooldawg6]

There are 2 cats on the S197. The exhaust is 2.5" all the way.
If an O/R H pipe(Pypes)the same diameter as stock is only gaining 8-10 HP, how can high flow cats gain more unless it is larger diameter and engine output is seriously raised?

 

[Easley]

I had the pro chamber with my stock cats. It was quieter than stock. I then put on loudmouths. That was nice sounding but at highway speeds the interior noise drove you crazy. I removed my cats, put the stock mufflers on and ta da! just what I was looking for. Nice low rumble, gets loud when I step on it, and nice and quiet inside on the highway.
http://www.youtube.com/watch?v=qAsl4TC2nrI that's my current setup

this is with the cats and loudmouths
http://www.youtube.com/watch?v=IAcKgXzNVU4

 

[ElCid2006]

Unless you absolutely need to leave your cats in place for emissions, replacing them with high flow cats is near a waste of money if you're not going after sound. The stock cats flow really well. The shop I deal with said it is a waste of money for a power benefit.

My car is registered in Georgia, so I will have to have it inspected. New cars are exempt for the first three years, so it wont be due until 2010. I've thought about running an off road h-pipe until then, but I don't really want to have to go back and switch it out again so I will most likely go with a catted model. As for sound and performance, I'm looking to to louder and deeper.
I'm in the Navy, and I will be adding some more parts when I return to the States. I'm looking at adding the h-pipe, pulleys, shifter, and a tune, so I'm open to suggestions.