hey all new to the forum and have a quick question. just replaced my swapped b18c with another lower km b18c when i bought the car it had the whole exhaust already done (header 4-2-1, highflow cat and big fart can out the end. now when i got the car cert&e-tested my mechanic said i should consider going with the type r stock muffler, including saying that my car is super loud and super heat lol. its got a mean sound right now but it is overly loud. my question is this, with the big can am i losing back pressure? and will the type r muffler correct it and give me more hp? aswell how much quieter will the car be? thanks

 

backpressure is a myth. you want the least amount possible. honestly, for bolt ons, it doesn't matter.

 

straight through mufflers do not restrict flow. If you did all that work to the exhaust, what size pipe did you use? it would be a lot quieter with the stock muffler on, you wont loose too many horses. In my opinion, having the stock muffler is wayyy better than having a fart can. straight pipe all the way

 

you want a little backpressure for torque if its NA.Turbo is another story.

but lose the fartcan and find a real muffler. OE is fine, or magnaflow, or ____

 

Agree with this 100%. I fell victim to that myth for a while then I got thoroughly schooled.

 

thanks guys, that being said perhaps i should just go with a different straight through muffler? like a magnaflow / thrush because the can thats on there i think is no name crap i didnt do the exhaust just the swap on the motor, plus it looks like s***.what has everyone else been using? thats worked for them?

 

my friend has a skunk 2 exhaust for his b18 eg coupe which sounds good.

 

I love my apexi ws2 exhuast on my jdm b18c, sounds ffing awesome! Not overly loud, until you hit the higher rpms at least hehe.

 

3" is beneficial on all b-series h-series, and k-series, period. It is probably true for d-series too. You will gain power everywhere on the power band.

And about 40 decibels.

 

i run 3 inch a world of a difference from my 2.25

 

Good info I also have a b18c swap in my gsr I'm running 2 1/2" pipe stock cat apexi ws2 exhaust but I think its not load enough.....if I put a test pipe on you think it'll make a difference???

 

I'm satisfied with my Greddy Evo catback, CARB magniflow cat, and CARB DC header. I'm losing some torque with my cali legal parts, but that's life...