High Flow cats, and other bolton goodies

Tatersaladx · 09-05-2008, 10:26 PM

Eventually once i get my cherokee on the road im going to put a bigger exhaust most likely 2 1/2, I want to put in headers, I was thinking the edelbrok ones on quadratec, a downtube thats not bent or restricted, 2 1/2 cat back, but i havent decided, on what to run for a cat, any recomendations? I was also looking at performance chips, and programers, ignition kits, and a better flowing airsystem thats not cold air. Maybe some mustang injectors, and a larger throttle body. Anyone have any success with bolt ons?

eliassami5 · 09-06-2008, 07:08 PM

magnaflow high flow cats are pretty nice from what i hear, im getting one in the future. NPR or NP something lol makes good headers and they are around $200ish, cant find the link right now but someone will prob chime in on that. TB spacer wont do much other than change your torque curve. A bored TB will give you much better performance and if you do it yourself it wont cost you anything, 62mm is the biggest you can go without having to bore out your intake hole i believe. Ive heard nothing but bad things about 4.0+performance chips, so thats your call on that, mustang injectors wont do much if anything unless your oem injectors are about dead already. A real CAI will have noticeable effects, or a hood cowl intake is also good too.

seanyb505 · 09-08-2008, 07:45 AM

APN is the header referred to above. You only need one. A cheap $50 ebay CAI works, but you will see better gains by doing it right and shielding it. As said above the computer is good from factory and everyone who bought a programmer didnt get that much from it. I would put 200 toward something else. You can also look for an intake manifold from a 99+ 4.0. It has curved runners and a larger plenum volume so it flows better.

Brandonsask8er · 09-08-2008, 04:29 PM

I have a full flowmaster exhaust and a header from jeep4x4center that was fairly inexpensive with a new down pipe. I did all of this for under 500$ you should look into that if you dont want to spend much money.

XJLI · 09-08-2008, 05:56 PM

best hi-flow cat IMHO.

http://cgi.ebay.com/ebaymotors/sheep...spagenameZWDVW

tis what i run.

XJ4oh · 09-08-2008, 10:39 PM

My honest opinion:

If your catalytic converter isn't shot and is in good shape, don't bother to upgrade... unless you are going a true 2.5" system and don't want that as a kink.

I replaced my rotted out rattling stocker with a Catco high-flow and it sure as hell was nice to not have the rattling, but I didn't get any more performance than the stock converter when it wasn't blocked up.

eliassami5 · 09-09-2008, 12:27 PM

Quote:

Originally Posted by XJ4oh

My honest opinion:

If your catalytic converter isn't shot and is in good shape, don't bother to upgrade... unless you are going a true 2.5" system and don't want that as a kink.

I replaced my rotted out rattling stocker with a Catco high-flow and it sure as hell was nice to not have the rattling, but I didn't get any more performance than the stock converter when it wasn't blocked up.

A high flow cat is just another step in the process of getting better performance and MPG. Having a good intake system and then having a stock cat restrict that flow will not do you any good, now having a good intake and a good exhaust setup will have a noticeable affect on performance. It might not be a huge improvement but the system as a whole will be better off with the high flow cat then without.

XJLI · 09-09-2008, 02:56 PM

Quote:

Originally Posted by eliassami5

A high flow cat is just another step in the process of getting better performance and MPG. Having a good intake system and then having a stock cat restrict that flow will not do you any good, now having a good intake and a good exhaust setup will have a noticeable affect on performance. It might not be a huge improvement but the system as a whole will be better off with the high flow cat then without.

agreed.

Quote:

Originally Posted by XJ4oh

My honest opinion:

If your catalytic converter isn't shot and is in good shape, don't bother to upgrade... unless you are going a true 2.5" system and don't want that as a kink.

I replaced my rotted out rattling stocker with a Catco high-flow and it sure as hell was nice to not have the rattling, but I didn't get any more performance than the stock converter when it wasn't blocked up.

just throwing on a hi-flow cat on an otherwise stock breathing motor does nothing.

XJ4oh · 09-09-2008, 11:54 PM

Quote:

Originally Posted by eliassami5

A high flow cat is just another step in the process of getting better performance and MPG. Having a good intake system and then having a stock cat restrict that flow will not do you any good, now having a good intake and a good exhaust setup will have a noticeable affect on performance. It might not be a huge improvement but the system as a whole will be better off with the high flow cat then without.

I agree. I'm not trying to deter someone from buying one if it is in their plans, or the stocker needs replacing.

It will flow better for sure, but unless you have a bit of work done to actually move enough extra air in and out, you won't notice much.

Quote:

Originally Posted by XJLI

agreed.

just throwing on a hi-flow cat on an otherwise stock breathing motor does nothing.

Correct.

Thats really the point I was trying to make.

I have seen more than a few times, someone buys a hi-flow converter on a whim that it will noticable improve performance, and they are dissapointed when it doesn't do a thing.

XJLI · 09-10-2008, 08:03 AM

scupking · 09-11-2008, 01:30 PM

Things to get are

1. Remove the air silencer and put in a K&N filter on the stock air box.
2. 60-63mm TB
3. A full 2.5" exhuast system with a magnalfow highflow cat and new headers.

All that stuff should be good for around 210-220hp.

eliassami5 · 09-11-2008, 05:05 PM

Quote:

Originally Posted by scupking

Things to get are

1. Remove the air silencer and put in a K&N filter on the stock air box.
2. 60-63mm TB
3. A full 2.5" exhuast system with a magnalfow highflow cat and new headers.

All that stuff should be good for around 210-220hp.

lol 210-220?? riteee

SoloCamo · 09-11-2008, 05:35 PM

205 tops with only those mods..

A stock box with a K&N drop in is going to bottleneck the exhaust big time.

XJLI · 09-11-2008, 05:39 PM

k&n filters let too much in IMHO. paper ftw.

and id keep 2.25" exhaust all the way, if anything, go 2.5" to the muffler than run a 2.25" tailpipe. you need to keep the exhaust speed up.

lancebezdek · 11-02-2009, 05:58 PM

i agree with some of the others in saying that only a cat will do nothing. speaking for myself on this one, i have no cat and i am looking for info on headers and the precat situation. i have seen many different brands, and from what i have seen it would either be a clifford or kolak. i looked and from what i see there are 2 sensors above and 1 sensor below the precats. how do the headers work with the precats?