which one would give me the best gain in tourqe and hp overall?? l need better bottom end and top end, l drive a sohc 96 civic ex with just an intake and 2.25 in exhaust if that helps.

It is the difference of .5 horsepower, or .6 horsepower.

Go either way.

Neither will do much for ur car.

If u want to feel REALLY dumb, buy either one, because they say they will get u 10+ hp, or whatever. Take it to a dyno. Drive it like normal, on the dyno. Normal shifting, no racing the engine or anything. You will see ZERO gains.

Intake, headers, exhaust, only provide gains in the peak of rpm. For normal driving? Nothing. Sometimes, even a loss.

So, u have two options. No gain. Or a slight gain, if u keep ur car above 5,000 rpm all the time. Which will blow the engine. And a change of 10 hp? not noticeable to the driver or the car. It will sound different, & u will drive it harder, but it wo not actually be any faster.

Take it to the track & see. :)

http://importtuner.com/powerpages/0505it_1998_honda_civic_ex/index3.html

Or go read that. -3 horsepower, sometimes. 0 horsepower, sometimes. Even at peak, only 3-6. You can get that, from new sparkplugs.

And just like advertisers, on the last page, they say the gain was 6 horsepower. So, they ignore the -3. The 0. The 3-6. They only take the highest number they see. This is not a good representation of performance. It is inflated numbers.

the 4-2-1 will give you better bottom end..4-1 will give you top end..hp depends on brand and other mods youve done

if your looking for a noticeable gain, a 4-1 header from DC sports is the best choice, if your looking for just a daily driver header, with an all around performance boost, a 4-2-1 header is the best, typically 4-2-1 headers are more popular and cheaper

4-2-1 will give you low to mid range power dc sports makes one #hhs5013.without other engine mods your not gonna get much more out of it.

4-2 will be better, but would be best if you redid your entire exhaust. header all the way back to the muffler