Prepare for dyno tune

[mugen24]

I will have a dyno tune very soon.

For my car(B16A4) now has a 4-1 S-S header + 92 civic si original cat + 2.25' cat back system + xforce twinloop muffler.

do i better need change to a 2.25' high flow cat to gain some more power from dynotune? big difference?
If i dont change the cat, how bad will it force?

[misteR_bilzz]

if your planning on gettin a hi flow cat in the near future and its on hand now get it tunned with it on. it make the most of the mod.

[mugen24]

havent got it on hand. if i need it for sure, i will go to a local shop and get it install b4 dyno. just want to know how important is it for the exhaust system, performance and dyno result.....

[barefootbonzai]

get an 2.5" system all the way through for best results. that's 2.5" cat and 2.5" mandrel bend, any exhaust shop should be able to do it for you.

but if you're tight on cash, i would change to a better cat, cause if's the stock SI cat, it's only 2".

[mugen24]

the thing is my system for now is 2.25' throughout. can i still put a 2.5' cat in? stock R34 cat will do? or just go to a local shop for a 2.25' hi flow cat?
barefootbonzai, plz give me some good exhaust shop.....how is right price exhausts on moss street?

[b18c_crx]

any exhaust place should be all the same man maybe the price will be different

[EKVTIR-T]

What size is the header outlet?

[mugen24]

im not sure, i think is 2.25'. if it's 2.25, can i put in a 2.5' cat?

[EKVTIR-T]

im not sure, i think is 2.25'. if it's 2.25, can i put in a 2.5' cat?
It's possible but find out the collector/outlet size and go from there.
If it's a decent 4-1 header it should be 2.5.
If it is,may as well do the rest in 2.5 as others have said.
Straight thru b pipe muffler and the twin loop.Will be nice:)

[mugen24]

If the header is 2.5' and the catback is 2.25. what size should i go for the cat for now b4 dynotune

[EKVTIR-T]

2.5 to match the headers.Try that and go bigger piping in the future maybe.
Also try to make sure the 2.5 to 2.25 step down is smooth.

[mugen24]

is DC2R or EK vtir factory cat ok for my situation?

[barefootbonzai]

If the header is 2.5' and the catback is 2.25. what size should i go for the cat for now b4 dynotune


2.5 to match the headers.Try that and go bigger piping in the future maybe.
Also try to make sure the 2.5 to 2.25 step down is smooth.

yeah that's what i would do.

But if your header is 2.25 collect, just get a high flow 2.25 Cat to suit the entire system and that should be sweet.

[mugen24]

went to right price exhaust today, they quoted me the metal cat with $310 fully installed.....but i dont know they talking about the branding 'metalcat' or just a metal made car. (Is a genuine branding 'metalcat' like that cheap?)

and then i went to Lee's exhaust, they quoted me $290 for a magnaflow cat with fully install......

so which one should i go and have they quoted me the reasonable price?

[mugen24]

anyone? :)

[SPEEDCORE]

Clarify re: the metal cat first with right price...

[mugen24]

but i found the 'metal cat' even on ebay is $300++ for the cat itself, how come they can do $310 with fitted....