The first 2 "cats" you still have are preheaters, so technically your car doesn't have cats right now. Switch to a catted x pipe and I think it will feel better all aroundvld said:Just bought an 03 gt. Looks like the previous owner cut out the back cats. She seems to lag through first then really kick it in second. A friend told me the the loss of rear cats is what is causing the sluggish #1 gear performance. Any truth to this?
nah, that is a load of BS. If they removed the rear two cats, your SES light should be on unless their is a chip installed or some MILs.vld said:Just bought an 03 gt. Looks like the previous owner cut out the back cats. She seems to lag through first then really kick it in second. A friend told me the the loss of rear cats is what is causing the sluggish #1 gear performance. Any truth to this?
no newer mustangs have 2 sets of cats. Some Older ones had 3 sets though.hognutz said:this thread cracks me up. from what I understand no cats have been removed. what had been removed are the resonators.
cats are up front I do belive and the resonators are down stream if memory serves correct.
these threads always kill me. If cats are such a good torque producing item why not put more in the system to increase torque. ha ha.
given the same tubing diameter you will never have a better preforming car becasue of cats. that is the stupidest thing I have ever heard. when designing and exhuast you set you torque curve by the diamter of the tubing mainly not buy putting restriction in the exhaust. think about what you are actually saying.
now one could argue going up to 2.5 from 2.25 could shift the torque curve up. I had the opposite effect on my x-pipe. I had noticably less traction from a roll than stock even with the 2.5 tubing.
big blue said:before I put on the O/R Prochamber. I could also break the tires loose just by stomping the gas from a rolling start. Now it's all power at 2500+ rpm. That is the magic number because at that rpm the car comes alive, it's acctually scary that I can be cruising along and push it to 2500+ hard and the tires will break and the car fishtails.
I also had a 2.3L mustang and put a SVO exhaust on it just to see what kind of power gains I could have. There was a major need for back pressure in that car because what power it did have was gone in daily driving. It is all about efficiency. The car is more efficiently making power in lower RPM range with 2.25 pipe and cat's, but after a set # of higher RPM's they are a major restriction.
No you are thinking the wrong way. You do not gain power by creating restriction. What happens is, when you remove the cats or get a larger mid-pipe without cats, you flow more creating more power but it moves your power band up slightly. Now when you put the stock stuff back on with cats, you loose that added power and it moves your power band back down so you feel it sooner.djtech said:Where can I read more about exhaust restriction creating more low end power?
Just think, back before catalytic converters were installed on cars how much power they were losing! That must be why the 60's cars had no torque.
mogs01gt said:no newer mustangs have 2 sets of cats. Some Older ones had 3 sets though.
white-04 said:How about this....we've seen data on how mufflers have made more hp than open pipes. Why can't the same be true for high flow cats?
I agree, if it is between the stock cats and an O/R pipe, I'm taking the O/R pipe. But a well made hi-flow cat could concievably outlflow a straight pipe. I haven't seen any data on it, but I wouldn't be surprised given what they have done with mufflers. I'm not saying a lot of hp, but 1 or 2 hp more wouldn't surprise me.
Nope, 4 cats on must mustangs and I think the Cali models had 6. If it was a resonator, then there wouldnt be a reason for the rear to o2 sensorshognutz said:I think you are mistaken. I think they have 2 cats and two resonators. I used to think they were all cats as well but someone informed me I was wrong.
mogs01gt said:No you are thinking the wrong way. You do not gain power by creating restriction. What happens is, when you remove the cats or get a larger mid-pipe without cats, you flow more creating more power but it moves your power band up slightly. Now when you put the stock stuff back on with cats, you loose that added power and it moves your power band back down so you feel it sooner.
YOU LOOSE POWER, you dont gain it with adding restriction.
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