I have only had my civic for about 2 months now, and all I currently have is a Tsudo-N1 catback exhaust. I just purchased a SRI off ebay, and will most likely be using a dryflow filter with that. I plan on getting a DC Sports 4-1 header within the next couple of months.

I was just wondering about how much HP gain over stock I will have achieved, just for my benefit. Any guesses are appreciated, as long as they are honest. Thanks

 

10-15 hp maybe a little more.

 

With all 3 maybe 10-15

 

If I buy the header, will I also have to purchase a seperate downpipe, or can I just install the header on the car as it is?

 

well.....the header bolts onto the block, then it bolts onto the cat, which bolts to the catback. So install the header and bolt that up to the stock cat, and then bolt the catback onto the other end of the cat and you will be all set, i dont think you need anything else (although i'm not that familiar with the newer gens)

looks like youve got a good plan on your I/H/E, good luck with the install!

and 10-15 sounds about right for the gains.

 

come on guys! why are you giving such false numbers? you will not get 10-15... more like 5-7. the d17 engines do NOT respond well to bolt ons like IHE

 

Coming from the guy who has given morebad info on this forum than anyone else. Im basing my numbers off a dyno jet. What are you basing your numbers off of?

 

they are right about gaining 10-15 but what is that going to be when it gets to the wheels? maybe like 5-7. just a guess sorry to butt in.

 

did you dyno your car before and after?

 

Not my car... A 2001 ex, but yes before and after. The guy had the shopinstall the intake, header and exhaust after his 1st pull. He gained 11 hp and im not sure how much torque.