High flow H pipe with cats?

[GRAYPNY]

What's a good choice for a high performance H or X that still keeps the cats? Shorty headers aren't suppose to be worth more than about 5 HP and I don't want to lose the cats and go with long tubes.

I'm currently running the FRPP X pipe and the FRPP GTA mufflers.

 

[Bingo]

I don't think I've seen a hi-flow catted H-pipe that bolts up to the stock manifolds.

You have some choices with an X-pipe: Bassani and SLP are the ones that come to mind. You could get a Prochamber or a Magnaflow X-pipe to bolt up to your stock cats, but then you'd need to do some cutting.

 

[MattP343]

The only one that has HiFlo cats is the MRT H pipe..It will bolt up to stock manifolds but it is a tad pricey

 

[GRAYPNY]

Well how about H or X with HiFlo cats? Does your Bassani trumpet?

 

[MattP343]

If you're asking me which I perfer, its really all up in the air...I personally LOVED my exhaust (Bassani X and Stingers) but I also LOVED my friends O/R H and Pypes Mid-Muffler - So I can really be swayed either direction.

There was NO trumpeting with the HiFlo cats on, but I would bet if I threw the race pipes on there would be slight trumpets in the lower RPMs at 1/2+ throttle. You can check out my exhaust clip if you want to get a better idea...Here is Bassani X with Cats and FRPP Stingers - Im selling the X because Im going to go with Longtubes

http://www.youtube.com/watch?v=GD3htFQg9bU

 

[Enitalp]

[Don_W mode]

Don't even think about hi flow cats, never again

[/Don_W mode]

 

[MattP343]

haha oh man

 

[don_w]

[Don_W mode]

Don't even think about hi flow cats, never again

[/Don_W mode]

 

[psfracer]

Well, John at ST called me today---one of the high flow dynatech cats was starting to degrade and come apart. A piece 1/4 inch in size already came apart on one of them. I know just last month when I took out the trans, I specifically looked at the cats at that time and everything looked ok. But since then I have made a few passes at 13psi with a more aggressive tune and some dyno passes on 16psi.

So I had John just hollow them out, and that is where I am going to run the wideband with the rear 02 sensors turned off in the tune.

 

[don_w]

Holy shit!! I'm glad they caught that Paul... that could have been disastrous! Dynatechs are the frikkin worst POS cats ever!


But, I still have two brand new ones in the garage if anyone wants them. Make me an offer. hahah

 

[psfracer]

Well, I guess on the bright side I can run c16 if I want---but the unleaded 109 should be good.

I hope the car is not too loud, I like the sleeper aspect of the car. At least I won't be worried about the cats coming apart anymore.

 

[MattP343]

Haha Its funny to hear 109 and C16 race gas go hand in hand with the term 'sleeper'...Its not too common

 

[cekim]

Well, I guess on the bright side I can run c16 if I want---but the unleaded 109 should be good.

I hope the car is not too loud, I like the sleeper aspect of the car. At least I won't be worried about the cats coming apart anymore.

Without resonators or something put in there to compensate for the missing cats - its pretty loud... no sleeping to be had...

 

[delurker]

JBA longtubes with catted JBA H-pipe here.

 

[shatter]

Can't we find a way to run longtubes in California and still pass smog?!!?

 

[don_w]

Can't we find a way to run longtubes in California and still pass smog?!!?

You don't have to worry about it until 2013...

 

[Jon_Purdy]

Anyone out there have the Magnaflow Tru-X setup? If so, what do you think of it? It's on my wish list but would like to hear more about it first.

Jon

 

[94tbird]

install some resonators after the midpipe and trumpeting is solved and you can run them with no cats

 

[MattP343]

Can anyone confirm if running the pypes midmuffler system with an O/R Pipe will cure trumpeting?

 

[TexStang]

for the most part yes, it will. One of my buddies here in town is just running resonators in the same position as the mid-muffler system, and it sounds pretty nice and doesn't trumpet