I was debating on upgrading to a high flow cat and I was wondering if anyone here has done it.. Is it worth the $$ for the upgrade? Any input is appreciated ;-)

 

No, not unless your cat is bad/broken and OEM or replacements are expensive and hard to find. Modern OEM cats flow quite well.

 

Modern cats flow better then their older counterparts, but the Fit cat still flows like crap. Its severely emissions-minded.



Getting rid of both cats means you see a noticeable power increase, and measurably better MPG's

 

I have an 07 fit sport (5-speed) and I've already installed DC Sports short ram, ceramic headers, and a full cat-back exhaust. Wondering if completing the flow with a performance cat will make a difference with my upgrades..

 

How much of a power increase would you expect?

How much could you expect your mpg to improve?

 

To be completely honest I wasn't sure what to expect, that's why I figured I would ask and see if it's worth it. I'm expecting some HP increase, but wasn't sure how much with the upgrades I've already done

 

On my 2013 fit, I would guess around 8-10hp was added removing both cats and maybe 1-3mpgs.

Its not a drastic change. Its something you notice a bit more as you drive.

Initially it felt great since I did not do an idle relearn or abttery pull. Once the computer re-optimized, the response was only a little better, but it still pulls harder up the same hill then it did with factory cats.

removing cats are not something to expect large amounts of power from. They might only rob 10-20% of exhaust flow. That doesnt necessarily mean its robbing a similar amount of power.

EDIT the power added was pretty much all on the top end of the rev range. low and mid range power saw maybe 2-3 ponies added, if that. There was additional torque though.

I can cruise at 25mph in 5th gear, and still add throttle to match 40mph as traffic moves its slow ass.

 

8 to 10 hp is significant to me on this car since it is doesn't make much horsepower to began with and it is relatively light. That's is awesome as a matter of fact. That's around a 7% hp gain.

And if the power is all up top, I'm extra happy with that as well since the CVT's rpm hangs at 6000-6200rpm at wide open throttle anyways.

The 2015 cat converter looks like a potential pain-in-the-ass. It looks like the post 2008's are the same setup as well.

 

the cat itself might be similar, but it seems the EGR tube is setup differently.


I dont think you will notice extra power as much on a CVT, due to the way it does its job.


It would be much more noticable on a manual or true automatic car. one that can tie the rpms to the road more directly. a CVT feels "mushy" I guess.

 

The cat on my GD is pretty easy to get to, considering I've already done my headers and cat-back so I've gotten a pretty good look at my cat lol. As far as the gains go, if I can get another 8-10 hp increase I'd be very happy.. that's a pretty good gain out that little 1.5 liter motor

 

You will not see 8-10 hp from the L15 just removing the cat be realistic guys.

 

I was laughing too but you ruined it.

 

You can gain a chunk sure, but you wont gain SQUAT without a tuning solution folks...

GD = FlashPro
GE = (for now) Boomslang Harness and AEM F/IC

^Still waiting to see someone get this done and tuned RIGHT

 

You would be surprised what the parts will NOT do without a tune. Yeah the car will feel different but your power and is shit. When we did a baseline on the dyno the power was all over the place. Horrible flow. The Hondata Flash Pro is what is needed to correct the tune and maximize your gain.

 

Killed cats the car rpm gone up quicker
i think t1r is better than other, t1r rate around 6-7hp
Hondata sucks can't even cracked ge8 ecu