2003 Honda Accord EX
K24A4 i4 AT
DC Sports Header (Ceramic)
Injen Short Ram Intake
*HKS Exhaust 3''

I recently got an HKS exhaust (just the exhaust) from my brother and I got it installed and welded on at a muffler shop. After the installation, my overall car's performance slowed down. Im unable to accelerate as fast as I would normally do. During the installation, the guys who welded my exhaust said that they needed to create a custom pipe since the exhaust is bigger than the STOCK exhaust pipe. I believe that since the exhaust is meant for higher HP or compression cars that it is releasing too much air and isnt giving enough back pressure. I am unsure what the problem is but I know that it has to do with the exhaust because with my STOCK exhaust, my performance was fine. The whole cat-back is STOCK and only the exhaust was modified. Please offer me some input. Thank you.

 

Sounds typical to me... unless an exhaust is DESIGNED for your set up, you risk loosing what known as the scavenging effect. The results are often lower mid range torque in exchange for a free'er up range flow

 

Is it possible to regain the back pressure because I am losing power and torque and its burning more gas. I am noticing the gas burn quicker on the meter.

 

Not really, sorry. thats the trade off unfortunately.

This is one of the major reasons when that when I build a car... I start with the suspension and work towards the engine last. There is really very little to gain in the power category without spending big bucks... Go faster through superior handling and lighter weight.

Maybe someone else will log in that has more experience with that power plant

 

2nd this - got burned on my Accord, had to go back stock

...

 

so you only changed the muffler?

 

Yes, I only changed the muffler to an HKS 3''. Sadly to say, the car's overall performance has greatly been reduced. I am hoping there is another way to gain back the performance, but so far, there has been no hope. I am hoping someone could give me some input before I take it back to the muffler shop and get it removed.

Sigh. Thank you. Bad news.

 

If all you swapped was the muffler, I think the performance loss you speak of is in your head.

 

ya at first i thought you did an entire 3" swap which would result in loss of low end power but more in the top end. in your case though, it's just the muffler. the loss you would feel should be minimal.

 

I dont think so because when I floor it on my car, my rpm raise but my car slowly moves, I barely can reach 100mph when I normally could achieve that. My rpm is at 4000 and im slowly getting to 90mph... I am removing the exhaust tomorrow and I will tell you the differences in performance.

 

Believe me, I wish the loss in performance is only in my head, but it isnt.

 

maybe you transmission is taking a dump :-P

 

try removing the negative terminal from your battery so your ecu resets. maybe your ecu will relearn the 'new' airflow and won't burn as much gas

 

So your gear ratios have changed from a muffler swap is what you're saying??? lol. Well anyway, tell us what happens today

 

People still think your car "needs backpressure"?

Guess what? By going to too large of an exhaust, you actually CREATE backpressure! It's called Bernoulli's principle. The larger the pipe, it decreases flow velocity, and increases flow capacity. If you don't need the extra capacity, all you're doing is hurting the flow velocity, or slowing down your exhaust gas. Creating backpressure. Which is bad.

 

hks from what i know on my accord robbed power, so i got a greddy. and in doing research for an exhaust for my s2k the dyno shows that hks exhaust robs power on them as well

 

i also have a high flow cat if your interested, best mod i got for my k24

 

Im planning to sell my car within a year or two. I didnt get a chance to remove the exhaust yet but will do tomorrow.

Planning on buying a Nissan GTR. Can anyone give me some ideas on what car to buy. Price range is from 0-80k USD.

Going to part out my car.

Injen CAI.
DC Sports Ceramic header.
HKS axle back exhaust brand new.

Pics coming soon. THANK YOU! EVERYONE!

HKS ON ACCORD (K24) = LOL. Sucks.

Thank you again,
John


PS.

Here are some options:
Lexus IS 350
Lexus IS F
Nissan GTR*** <- I really want this one.
Infiniti G37S
Nissan 350Z, I dont like the 370Z look. -.-
_______________ <--- You fill in the blank. ($0-80k) THANK YOU.

 

HAHAha. Real funny. No seriously. I wish I had gotten a manual transmission, but I couldnt. Family reasons.

Please dont rag on my auto accord.

 

Indeed this worked and is helping me a bit more, but I still feel the slump in power, but a mechanic told me that I need to purchase a high flow cat. Can anyone give me some advice on this please. Thank you.

 

amazing how that myth started when 16 year old kids were dropping junkyard nailheads into old fords. now you have a kid with a new accord buying into it

 

Deff GTR or M3 E92. both awesome cars but car and driver ranked the M3 above the gtr. even a newer z06. Are you looking for more pure track car, class, or both?

 

He's not ragging. What he is saying is that at a given RPM, you can only do x amount of speed per that RPM, it's just how fast you get to that RPM.

 

I heard M3 has alot of electrical problems. Is this true?

Im also looking for a car that has performance & suspension.

Im thinking of the IS F with its 5.0L and maybe plan on buying the supercharger for it. The GTR is something I want to own but man, I think insurance is going to KILL me on it.

 

so.....what happend with the exhaust and hi-flow cat? I've been toying with buying a project car but was just gonna start working with my '05 accord. There doesn't seem to be a lot of performance mods due to the MAF. I'm an old school muscle car guy.....fuel, compression, cams and exhaust. I'm new to the tuner scene.Any help??????