I have a 22re with header high flow cat an a flowmaster (I think) an 2 1/4 inch pipe.

What I am asking is, would that have enough back pressure?

An what would happen if I don't have enough back pressure?

 

yes, you will have enough back pressure. flowmaster is a muffler based on backpressure for performance.

if you lost *enought* back pressure, you would feel a loss in bottom end torque.

 

you at least have a cat

 

i had a downey 4-1 header, no cat, 2 1/2" piping all the way out the back with a magnaflow but never really noticed much "loss". i would imagine if you dont have a good breathing carb and other go fast gooddies it may be a bit overkill....... but it wasnt for my truck.

http://s80.photobucket.com/albums/j166/alisn4x4/?action=view&current=doriftorev.mp4

 

ok i was wonderin, it seems like i have lost a lil power but im not really sure, an it seems like when i put the high flow cat on, my valve guide seals started leaking

 

you probably have lost bottom end, it's not really backpressure that helps but gas velocity and at low rpm the 22re doesn't flow enough to get things moving. it's the tradeoff of getting a bigger exhaust. don't worry about it. to get it back, you'll lose top end flow/power.

the cat has absolutely nothing to do with the stem seals leaking. They've been working up to it a long time.

 

now if you ran a 3" full exhaust with a header.... you better be rockin' a beefy turbo! lol

 

See I am also tryin to figure out why when I am goin up hill an I loose momentum an it starts to bog down a bit it seems like it has a small clatter an I am wantin to know what is causing that.

 

Because you have a 115 hp 4 banger. fewer cylinders tend to have to spin faster to maintain smoothness and it's just not a powerhouse of an engine. Either something is lose/broken or it's telling you to downshift. Even new motors with dual VVT don't have an full torque from idle to redline. Might also help to know what size tires, diff ratio, gear, speed, RPM, and hill slope.

With stock manifold, replacement Y-pipe/downpipe, no cat, and 2" thrush and tailpipe 1-3 are fine up most hills from 1500 rpm. 4th a little more, 5th needs over 2k to be smooth but it'll go uphill with fewer revs.