Rep Power: 0

OK, i do notice a consensus that people say one will not gain a lot of horsepower with i/h/e, but don't you also gain a bit of torque, and wouldn't that compound to noticably better acceleration? I am just trying to verify the benefits here.

Situation, CAI, 4-2-1 Headers, High Flow Cat Converter, Custom 2.25" Exhaust the rest of the way back, will i see:
HP Gains (low end & high end)
Torque Gains (low end & high end)
Increased Gas Mileage
Better Aesthetics

I simply could not get my hands on enough money to invest in a turbo, so i want to hear feedback on this for performance.

 
Rep Power: 0

i/e/h will run about $1k...and the most you'll probably gain is 5hp...if you're lucky. just save up and get turboed or swapped.

 
Rep Power: 0

You might want to check out some other options too. Try looking at some unorthodox pulleys. Minimal underdrive, and you'll get decent gains. ACT makes a 12 lb. flywheel that'll help in the same way. Just a thought....

 
Rep Power: 296

Nitrous = Best hp gains for the money you spend. Look at the nitrous diy, with the nitrous express wet 50 shot they got like over 170 hp to the wheels and over 200 foot lbs of torque... Something to think about

 
Rep Power: 0

Alright, I gave some time for people to respond and no one has responded in a week. So does anyone out there have comments about **torque gains** or **improved gas mileage**

 
Rep Power: 282

my two cents is you will get better gas mileage, but loose torque, personally from having the aem CAI, DC header, and 2.5 inch pipe without the cat, it got madd gas mileage, but lost some of the touquey feel (but i mainly did it for when i sprayed nitrous)

 
Rep Power: 812

I got way better gas mileage with stock intake and exhaust. Also, I bet low end torque would be better stock. I always feel more pull after taking off aftermarket stuff. Not worth it for the time and money, and power. On an older civic maybe, not on our ulev cars.

 
Rep Power: 282

[QUOTE=gearbox]I got way better gas mileage with stock intake and exhaust. Also, I bet low end torque would be better stock. I always feel more pull after taking off aftermarket stuff. Not worth it for the time and money, and power. On an older civic maybe, not on our ulev cars.[/QUOTE

 
Rep Power: 282

^****

 
Rep Power: 274

Yeah this has been messing with my mind for a while now too, I mean WTF? How can improved airflow make everything worse?
So... (using Monty Python logic here) if I do the opposite, I stick a banana in my exhaust my car will be faster and more fuel efficient because it's lighter, it will float, it must be made of wood... and therefore it's a witch!
J/P No seriously, The 5hp theory sounds right to me, as long as you don't lose too much back pressure opening up the diameter of the exhaust.

 
Rep Power: 812

Well it's all about how the car is designed. Reducing restriction of air through the system also causes it to lose velocity. So open it too much or restrict it too much and bad things will happen. You have to find a mid point, which is what stock is I bet. I had my throttle body bored 2-3mm over stock and my car bogged down to the point of stalling almost. All these i/h/e mods are not designed for our cars. On the older civics sure, the intake was so tiny that it was actually better to get a larger aftermarket model.

 
Rep Power: 0

I'm sorry I just cant believe that, I have installed aem sri, top speed header, tanabe exhaust and megan racing downpipe. Each time I installed something I felt a gain, yes it was a small gain but still it was a gain. Not a loss. DOES ANYONE HAVE THE DYNO TOO PROVE EITHER WAY, GAIN OR LOSS?????????

 
Rep Power: 290

I have no dynos, but after installing my mods I noticed:
1) due to less backpressure, from a dead stop I have to give twice as much gas or the car will bog when I let off the clutch, but once I get rolling the car is peppier than when it was stock
2) in-city mpg is a little lower, highway mpg is a little higher

Basically, I moved most of my low end torque into the midrange rpms for a more enjoyable freeway driving experience. When I was stock, not having the power/throttle response to pass or merge with faster traffic at highway speeds sucked since most of my commute is at 50+mph. But the trade-off is that until I'm rolling at 20-30mph, I have very little torque, which kind of makes my car have all bark and no bite when I'm sitting at a stoplight an I try and get the jump on some grandma in her Buick and fail.

 
Rep Power: 0

I have 3" exhaust, no cat, and 4" outlet. and I only have minimal backpressure loss.
Then again I run rich as hell. The FPR isnt working for *****.
but I put out a fair amount of exhaust. Its is setup for turbo but the old turbo exhaust is on the new allmotor. I am keeping it b/c I plan on turbo.
The only problem I have is from 1000-1255 rpm my car bogs and surges.

 
Rep Power: 0

well the gains you are feeling are in your midrange. your torque is probably lower but not significant enough for you to notice.

 
Rep Power: 334

hp gains: only at high end but not dramatic difference. but noticeable at some point.
torque gains: my best guess is it'll wont change postitively or negatively. but the smaller piping diameter size might help with the low end cause back pressure may help. but the bends on the piping help with your back pressure and low end.
low end = basically is torque.
increased gas mileage: rumors has it that intakes improved gas mileage but not sure about exhaust pieces. i doubt any exhaust piece will increase gas mileage dramatically just because the car is flowing more freely.

 
Rep Power: 361

hp gains: maybe very high end, if at all. like last 1500 rpm before redline. extra air and breathability. maybe
tq gains: loss of alot of backpressure can mean less torque. so if anything you may lose
low end: maybe loss in torque so maybe slower
gas mileage: better with CAI, nothing significant. save you $100 over life of car and spend $200

 
Rep Power: 294

More air = More gas burned right?

 
Rep Power: 812

Ya that's how it goes, however that doesn't necessarily equal more power on our cars. It does waste more gas for nothing tho.