Primary Cat delete vs Secondary Cat delete

[saeedg48]

I deleted my secondary cats and resonators and didn't feel HUGE gains..
what's the deal with that!? does my butt dyno need to be recalibrated?

come tuesday im deleting the primaries and going to reinstall the secondaries will I see more or less gains when deleting the primary cats in comparison to the secondary catdelete?

[mlchen34]

subscribed.

I'm deciding between the Challenge Street or Sport Mid-pipes mated to an Eisenmann Race.

[FVM3]

it sounds really raspy if you delete the both primary and secondary cats. What you need is S/C. I can feel the hp gain after deleting the cats

[saeedg48]

I'll b at the shop reinstalling my secondaries and deleting my primary cats..

FS fabspeed xpipe.. pm me if you're interested. also sedan Megan racing mufflers. pm me offers

[J08M3]

You wont feel anything. There's some gain on primaries but you'd need a super sensitive ass to feel anything. Measurable on dyno only. Possibly a slight advantage on 1/4 mike

[saeedg48]

Originally Posted by shift@red

If youre deleting the primaries and leaving the 2ndaries, youll see some good power. Thats really the only way to truly make power, deleting the primary cats.
Thats how the akra evo system makes its power, no primary cats, but has 100 cell cats downstream.

do you think its worth deleting them or should I just stick wt my setup?

[FVM3]

only thing is the exhaust note will be raspy

[geneatals]

dyno or vbox, don't rely on butt dyno to give you some positive reinforcement (although I assume you did not do a pre-delete dyno/vbox run did you), no matter what the case , you'll most likely end up deleting both either way

[Mike V8]

Go cattless.

[SchnellM3]

Just delete them all, you know you want to

[Grail05]

i currently have a xpipe RISS... with 200 primary cell cat and resonator.

The only thing i noticed was the sound. with my AKRA SLIP ON.... the sound made it more exotic...

although my RPM thoughout are pretty smooth... actually really smooth. i felt that below 3k rpm the power isnt there that was there on the OEM.... but it pulls quite a bit harder than oem, maybe having the primary cat does hold the power that everyone is talking about even on a 200 cell HFC...

I think i might just remove the primary cat ill give it about couple month until im bored with the sound...

right now its only been 3 days with my RISS xpipe so cannot say so much or give so much review but this is what i have noticed.

oh for those who are curious YES this thing will give you increased Emission light on... roughly about 60-80 miles...

[SchnellM3]

I have over 1k now on my Innotech and no CEl light, if you want to go completely cat less these are the pipes to get....


http://www.m3post.com/forums/showthread.php?t=501161

[UsurbrainM3]

+1 I have over 2k... and it makes me waste a lot of gas because of the melody it produces between 3-5k....

Originally Posted by SchnellM3

I have over 1k now on my Innotech and no CEl light, if you want to go completely cat less these are the pipes to get....


http://www.m3post.com/forums/showthread.php?t=501161

[IMG]

Originally Posted by mlchen34

subscribed.

I'm deciding between the Challenge Street or Sport Mid-pipes mated to an Eisenmann Race.

Hey man, i got the Challenge sec cat delete Xpipe and i can tell you that its a perfect fit like oem,high quality piece.ive also noticed some nice gains plus a nice exhaust note with the ESS NA tune !

Good Luck !

[MFKN3]

I've got the eisenmann race + challenge sport (primary delete with hiflo secondaries).

Eisenmann race only vs eisenmann sport only

Eisenmann race + challenge sport vs eisenmann sport only

[MFKN3]

forgot to mention, you will only really feel gains with primary delete. I also had a flash tune done for a few extra ponies and to avoid error lights

[aus]

Primary cats are 400cpi, while the secondary's are 200cpi. There's your answer AA to why yo don't feel much with secondary cats deleted.

[saeedg48]

Originally Posted by aus

Primary cats are 400cpi, while the secondary's are 200cpi. There's your answer AA to why yo don't feel much with secondary cats deleted.

THANK YOU!

[persian54]

What if you replace the primaries with HFC 200cell and delete the secondaries?

I.e. Gintani or AA pip vs a Challenege or Akra pipe (well, Akra is 100cel, but I'm referring to the design)
Or Turner Test pipes with the stock X section (200cell with resonators)

[Grail05]

Originally Posted by persian54

What if you replace the primaries with HFC 200cell and delete the secondaries?

I.e. Gintani or AA pip vs a Challenege or Akra pipe (well, Akra is 100cel, but I'm referring to the design)
Or Turner Test pipes with the stock X section (200cell with resonators)

I am currently running primary HFC 200 cel cat and a resonator...

Power wise not a big difference. It is very smooth though thoughout RPM...

Although i lost the power below 3k but after that it just pull pull but very smooth.. once you hit 80+ and floor it its insane..

i was expecting a little more boost or maybe a lot but then again having a cat in the primary section just might not be worth it.

PROS: power is there but not a lot made my AKRA SLIP on sounds more exotic... not so much of a V8 sound... the exhaust smell (i can barely smell the exhaust with HFC 200 cel... i put this on pros cause i love the smell... LOL

CONS: nothing yet

OVERALL: I am very satisfied with the results although i realized that getting an xpipe is not worth it with the Primary cat on power isnt that much of a difference nor can tell. to those who are thinking of changing an xpipe i suggest get the full xpipe without cats primary or secondary just put a resonator to avoid the rasp or just a bit of volume.

i will be removing my primary HFC 200 cel cat maybe in a month or 2 to see if it does make more difference. I think this is holding most of the power since its place the same as OEM even if its only 200 cel....

[persian54]

Originally Posted by shift@red

The most power youre going to see (assuming you keep cats somewhere in the exhaust) is from having NO CATS in the spot the oem primaries are located and having a 100-200 cpi cat where the 2ndary cats are on the oem set up.
So ideally, the akra set up, challenge or turner test pipes will be your best ways to make power since AA/Gintani keep cats in the oem primary location.

But doesn't keeping the HFC in the primary location help with the loss of low end torque many have complained about?

Also, would the difference be anything but maybe 3-5whp?

[Grail05]

Originally Posted by shift@red

Im not sure about what the gain would be, but as far as low end tq, without a tune, I think youll lose some, but what you will gain in the top and especially the mid range will be significant.

yeap with my set up that is exactly what im feeling... sucks when your below 3k.... i felt a big difference with OEM and xpipe with 200 cell when your below 3k rpm...

but when it passes that range... it just.... screams.....