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Not sure if this is the right place to post this, but here it goes.

I got a new 08 civic Si coupe and was wondering how I can add about 40-50 HP without adding any noise (or quiet the noise if possible). What would be my options? I would not want to add turbo, seems too expensive. I know little about engine work.

 
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you could do a k24 bottom end to give you some torque...but you would have to know about motor work

40-50 is a high mark without forced induction. well cams, race header, cai, exhaust, and kpro might get you in that ballpark....but you would eb looking at about $2-3k(depending on if you get a good deal on kpro) at that point and might as well go turbo. as far as not adding noise...get a quiet exhaust system

 
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well most mods that would give you a significant gain in power will make it 'louder' ... the whole point of modding the car is to let more air in and let more air out basically and with that you get a louder car. dont see why you would be interested in 50hp without getting a new exhaust, which is a very key component of any engine build.

with that said the only way i think you could get 50hp without any added noise is nitrous.

 
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why dont u want it to be louder i like it louder most people do

 
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Cause he's actually got taste.


I'm with you, man. I hate loud civics. Thing most people don't realize is that turbos make decent mufflers if you've got a fairly high quality exhaust system. My dream build involves full 3" tubing, but two or three resonators and a muffler. I want high flow, but I want it quiet.

That's about the only solution I can imagine. You're not going to be able to make 40-50 horespower without dropping some money, unless you're talking about nitrous. An All-motor build or turbo is really your only options, and supplement those with a quiet custom exhaust and you've got something.

 
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how would i get more power in my si

 
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^this really is the wrong website for 8thgens in all honesty, not the most knowledge of them is on here.. you should check out 8thcivic.com for your si

 
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go read the second post

 
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how about some thing a little cheper i do not have that much to blow on car parts.

 
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"You gotta pay to play"

 
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then start looking for junk on ebay
http://www.ebay.com/

 
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He's kidding.

eBay car parts, 9 times out of 10 will break within a year, get you laughed at, do nothing, or a combination of the above. (Assuming we're talking about no-name parts, not name-brand parts bought off eBay, obviously.)

But seriously. You want a nice car but you don't want to pay for it? Get real.

 
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i wasnt kidding...if he doesnt want to buy quality "expensive" parts...then he needs to go look for some junk off of ebay

i mentioned the cheapest HP gaining mods in my first post...with the exception of kpro and k24. If those are too expensive then i dont know what to say besides ebay

 
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supercharger

 
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you could also look into a throttle body spacer... and thermal throttle body and intake mani gaskets...those supposively can add HP...i know they make them for the k20a2 but i am not sure if they will fit your z1
do some research on those...i know for the k20a2 you can get the spacer, 2x thermal TB gaskets and the intake mani gasket for right around $150...and going by advertised numbers you can gain roughly 6-10HP at the wheels with all of that

 
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TBS dont give any power- I have one... it sounds cool, but its nothing.

I'm tired. I keep coming back to this thread to see the updates.

SC will cost you at least 3k...sounds like you'll have to pay for it if ya wanna go that route.

The first question all of you should of asked it... How much do you have to spend?

 
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^you also have a d17....i dont have one so i am going off of what i read. the k20 has a lot of heatsoak going on with intake manifold and TB. I dont see how that little thing can make a difference but supposively it does. I just read a thread...someone got one did a before and after dyno...2HP gain
so not much help but it is something

 
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Yeah, maybe a different motor could see gains... my TBS is supposed to add 10Hp and improve fuel economy, it doesnt.

 
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^ ^ ^ What he said

No hope for the D17,

 
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Thanks for the replies. I did some reading and want to change my question, how would I add more torque? I don't mean intake, headers, or exhaust, but maybe engine work? Man I'm new to modifying, I had a '02 maxima and didn't modify anything, didn't need to.

 
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k24 bottom end would give you torque

 
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K24 is an engine right? How would I get a K24 bottom end? And what exactly is the bottom end?

 
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The bottom end, as used here, is the big part of the engine. It's the block, crankshaft, rods, pistons, and all the ancillaries. Pretty much everything but the head. There are some guys on k20a.org that will sell you a bottom end for a good price, I've heard. If you want more specific information about the K20 and K24 series of engines, I'd head over there.

 
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Cool, thanks for the info. Seems like too much work on a new car though, maybe when it gets older.