AznPhoenix

Which will yield better performance? A high flow cat or a midpipe? Also, which is safer and more reliable? Sorry, this post must be a repeat, but I dont have much time!! plz post the best way ASAp!

fd3s_rx7

iTrader: (13)

either way you will need a ecu.

If you are running stock with out any ecu such as PFC. then I strongly recommend not to get a midpipe. But high flow cat I think you will be alright with it.

fd3s_rx7

iTrader: (13)

oh yeah,
a 3in downpipe and a cold air intake is what you should do for performance and reliable.

racer1

midpipe more performance. High flow cat more safety.

AznPhoenix

numbers? like w/ a dp, and cat, mp will make ?? hp more and high flow cat will make ?? hp more?

fd3s_rx7

iTrader: (13)

You will need a Power FC anyways for all that stulff on your car.

So once you get the power FC you will need to dyno your car to tune it correctly. That's when you will know exactly for sure how many HP you are getting.

911GT2

The midpipe might yield slightly higher hp numbers in the end, but cars with high-flow cats can make plenty of power (read: 400rwhp+).

IMO, if you need to ask, don't get a midpipe.

Montego

iTrader: (1)

He dosen't need a power FC (nor any computer) as long as he is boosting stock levels.

Edit- Why do you need this ASAP? Or actually ASAP!

Word to the wise when modifying these cars don't do anything rash and in a hurry.

AznPhoenix

imean, $$$ wise, i kno ill need sometype of ecu and as far as high flow cats go they are about $500 for avg ones. Midpipes are around $300 and what type of ecu will be sufficient to keep my car boosting correctly and my engine from blowing up. (type and $$$ wise?)

jpandes

I have both. I just got my Midpipe in the mail yesterday. I'm gonna try it out soon. I'm guessing that it's gonna be too loud and smelly for me as a daily driver. But, it should be fun on occasion.

BTW, here is what I paid(new):
N-tech HF Cat cost $372.00 shipped
3" SS Midpipe $112.00 shipped ebay

AznPhoenix

will a midpipe require enlarging the wastegate? I really need all the info I can get on the pros and cons on both the high flow cat and midpipe and all the necessary itmes to keep the car happy with it

Beast From The East

Wael from the Big List has some great empiracal evidence of the results on Hp and tourque on this subject:

http://www.efini.net/hpcomparo.htm

http://www.efini.net/tqcomparo.htm

His is a very nice site and you can learn more by just going to www.efini.net and wandering around.

Beast
(waiting for my to4s to come in.....)

AznPhoenix

ok i know those stats on the site comparing the pettit midpipe and bonex high flow, but if 2 cars the same except that factor was dif. Same driver but just one car had the high flow and the other had the midpipe, which would win in a 0-60? 1/4 mile?

Kento

The car that has the driver in it...

Beast From The East

Well, I can only speak for my own experience, which is comparing the difference between a STOCK cat and a Pettit mp. The big factor is weight - by ditching the stock cat you lose at least 50 lbs. of weight, and that's a huge difference in our cars. When I drive my car with the stock cat by myself, the power and acceleration loss is the same as if I had the midpipe and a passenger in the car. I can't speak to the weight of a high-flow cat ...

So, my best guess is:

0-60 - not much difference because tires, clutch, and driver are the major factors on 0-60 times. Since you said you could hold all other variable's constant, I don't think you'll be able to tell (hundreths of seconds difference).

1/4 mile - the additional top end hp coupled with the loss of wieght is going to give the mp an advantage.

The only true way to tell is to try both and go to the track. Unless you are a very consistant driver and can hold the track conditions steady (temp, humidity, wind, amount of gas, how much you weigh, whether you took a crap or peeded recently, etc.), you're going to be hard pressed.

I gained lots of top end trap speed with the mp added (over 10 mph), but my overall times stayed the same because of tire spin and inconsistant shifting.

I love my mp, personnally, and can't wait to get it back on the car.

Beast

Beast From The East

roflmao! Clever, very clever....

AznPhoenix

thnx

Mahjik

iTrader: (1)

Here's my take on the midpipe vs h-flo cat....

If you are going to get a midpipe, go ahead and have your wastegate ported. You may or may not need it, but it's not going to hurt if you don't. You see many more engines blown running midpipes than you do hi-flo cats. So if you aren't looking to kill your car quick, take the safer route with the hi-flo cat.

If the word "safe" appears in your vocabulary, then the choice is obvious.