<div class='quotetop'>QUOTE (mb1604 @ Jun 1 2005, 03:23 PM)</div><div class='quotemain'>ya probably around 15 whp. ive heard 5 for cai, 5 for header and 10 for a catback, i doubt its that high so i just say 15 total
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I think it's just plain too much. Well, we all know you can't add the HP gains one on top of the other, and still 15 HP seems like too much from just header & catback; and again, what headers are we talking about here? the entry level OBX / SS design? The GT headers from Kspec? HVE 4-1 headers? And also what catback? Diameter? At what noise level?
I think it's pointless to dream about a HP guestimate, the point is your car WILL be better powered and more fun to drive, just enjoy that; if your aim is to get the most HP numbers, then focus on other peoples experience like Random, Ultra (he has a lot of NA mods) and others.

<div class='quotetop'>QUOTE (hamhead @ Jun 1 2005, 03:45 PM)</div><div class='quotemain'>Depends on the car... on my Corvette, doing my exhaust system (custom headers, 4inch side exhaust) netted me probably around 35whp. If they are talking I-4s, then they are talking out there butt.
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I don't know if people from that website are talking about V8's, but all the dudes here are talking about Betas, and I don't think you could get close to 10WHP with just CAI/Header/Catback, even with top-notch brands it would be difficult.

 

<div class='quotetop'>QUOTE (2kShark @ Jun 1 2005, 08:14 PM)</div><div class='quotemain'>I doubt this. On some sites they claim that with 4-2-1 headers, accompanied by BOTH a Cold Air Intake Induction system, and a catback exhaust gains can be around 45 bhp (or as mentioned, 37 hp at the wheels) I know that CAI/headers may not do a lot, but maybe with the addition of a catback would that really increase the gains?

My estimation is more like eh... 15-20 hp perhaps.
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45horses is way too much. 15-20 is closer but still may be a little too high, 5+5 dosn't always =10 in the world of horsepower. People always have high expectations of their cars untill they get a dyno and reality sets in. A way to avoid guesstimation is to dyno your car stock and then dyno it again after you've added on mods. Another problem I've seen, especially in V8 guys, is that they take adverisements literally, an ad will say you CAN GET UP TO 15horses with a cat back or UP TO 20 horses with a header. What they're saying is, it's possible to get 15 or 20 horses, dosn't mean you will get those numbers.

2K, what site did you look on that said you'd gain 45horses?

 

<div class='quotetop'>QUOTE (Zman @ Jun 1 2005, 03:23 PM)</div><div class='quotemain'>I don't know if people from that website are talking about V8's, but all the dudes here are talking about Betas, and I don't think you could get close to 10WHP with just CAI/Header/Catback, even with top-notch brands it would be difficult.</div>


i would beg to differ from that opinion, 10 whp from cai/headers/exhaust should be easily obtainable (just dont expect more than 15-20).....theese bolt-ons will provide the most gain of any n/a mods, but they all add up.....

 

<div class='quotetop'>QUOTE </div><div class='quotemain'>2K, what site did you look on that said you'd gain 45horses?</div>

www.ssautochrome.com (of course!) wink1.gif

Well, I have to see what my car can pull I guess then. I'm talking about top-notch quality brands, mind you. The intake is AEM, 4-2-1 Maintec Header, and perhaps an Ark Catback. No OBX or what have you

 

I say about 12-17whp from those mods.

 

^^ Bingo. wink1.gif

SSA also makes higher end applications for larger displacement engines, so might have been refferring to that. Who knows. :unsure:

 

OK, since everyone is guessing, I'll throw my bet in.
I think with Maintec Headers, an AEM CAI (which both are in fact top notch) and if you add a full exhaust (2,25" mandrel bent) you are going to be close to 10 WHP.
Granted if you add to that combo the 1.8 camshaft you will get close to 15 WHP, and with some ECU tuning (piggiback like SAFC) on top of that you could be passing 20WHP.

It would be great if you dyno your car after what you are going to put to get an idea; I still have to take mine to the dyno to verify how much the headers (also Maintec) and AirRam have added to my engine, maybe some of these coming weekends...

 

No way the small bit the 1.8L cam gives is going to tack on 5whp @ the top of the powerband. However, you may only get 10whp with that setup, because your not getting mods that add to the high-end.

AEM CAI sucks for the high-end, as we all know it only gets 3whp@6000RPM from AEM's own dyno.

2.25inch mandrel on a 2.0L engine is frankly too small IMO, you see all large Import I-4 manufacturers (GReddy, APexi, etc.) going with 2.5 mandrel setups simply because a loss of 2whp @ 2300RPM doesn't matter to the buyer when it adds 3-5whp more at the top over a conventional setup. Many shops are proving that even in N/A form, many I4 cars can benefit from 3inch dump pipes (meaning hardly any exhaust piping at all) with losing next to nothing on the low-end. Course thats not probable because of noise for a street car, but less backpressure is better is becoming more common nowadays. How that effects the long-term durability is still up in the air... but 2.5 mandrel is a safe compromise from going that extreme.

And of course MainTec's are 4-2-1. More midrange HP and torque.

So basically you might add 10whp @ the top with those mods, with a better drivability curve throughout. If you went AEM CAI - 2.5 Mandrel - HVE 4-1s, for example, then you will probably see the 14-17whp gains we speak of, but a slightly less powerful low-end.

 

Alot of place add up the HP gains. So the 50 hp gain might be 20 from the CAI, 20 from the header, and 10 from the cat-back. Unfortunately that is not the way it works.

I did read an article that I think was in SCC, (or it might have been Import Tuner) that showed mods on a Nissan Sentra Spec-V. They installed I/H/E and gained about 47 whp, they backed it up on the dyno with every mod.

 

If only i/h/e racked up power like THAT.=/

True, I think 15-20 hp may be wishful thinking, but I'm sure with those mods the car will definitely pull a lot harder.

What do you think the improvements on my 0-60 time would be with that increase of power? I run an average 9-9.5 with the CAI. Probably a tad lower than that if the air is dense/cold. (night time)

Still, no matter how many ponies you gain, you're certainly going to feel that power acting on your car.

Oh yeah, the ARK N2 catback is a 2.5" mandrel bend, not a 2.25.