Gutting out the stock cats

[diss7]

Originally Posted by bkblitzed

ah okay thanks. I might just gut the overpipe cat then.

Yes, I'm going to do the same.

[Ryan86]

Taking the cats out stock exhaust gave a fellow 86er great torque gains. In fact I have full 63mm performance pipe with Header and this guy got almost the same gains on a dyno run as I did.

Here is dyno chart of before and after cat removal of stock header and front pipe.

[KONVERTER]

The cat delete pipes are cheap enough... Gutting cats is not worth the time or effort IMHO... You can sell your cats for half the price of a pipe to a scrap yard for the metals alone...

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[cf6mech]

Finished gutting my header cat when it started to gut itself all on its own with my turbo set up,...so I'm totally catless now. It a little louder now, backfires more frequently as I burn E85 and you definitely can smell the emissions more.

[WolfsFang]

Looks like I will be doing this on my day off. What do you guys use? Just a really long screw driver?

[diss7]

Originally Posted by WolfsFang

Looks like I will be doing this on my day off. What do you guys use? Just a really long screw driver?

Youll be there forever with a screw driver. Drill with big bit around the outside, then the centre will fall out. Then tidy. Wear breathing protection, who knows what their made out of.

To those commenting about just putting a decat pipe in. Yes this would be easier, but in some places (like Nz) this would fail the warrant of fitness inspection that we have to obtain annually.

2. A vehicle (other than group L vehicle or a class MA or MC motorsport vehicle with a valid motorsport authority card) that was first registered in New Zealand on or after 1 May 2010 and manufactured from 1 January 1990 has a catalytic converter removed where there is evidence that one was originally fitted.

[WolfsFang]

Originally Posted by diss7

Youll be there forever with a screw driver. Drill with big bit around the outside, then the centre will fall out. Then tidy. Wear breathing protection, who knows what their made out of.

To those commenting about just putting a decat pipe in. Yes this would be easier, but in some places (like Nz) this would fail the warrant of fitness inspection that we have to obtain annually.

2. A vehicle (other than group L vehicle or a class MA or MC motorsport vehicle with a valid motorsport authority card) that was first registered in New Zealand on or after 1 May 2010 and manufactured from 1 January 1990 has a catalytic converter removed where there is evidence that one was originally fitted.

I have a borla cat delete so I will be gutting the stock header.

[Calum]

Originally Posted by diss7

Youll be there forever with a screw driver. Drill with big bit around the outside, then the centre will fall out. Then tidy. Wear breathing protection, who knows what their made out of.

To those commenting about just putting a decat pipe in. Yes this would be easier, but in some places (like Nz) this would fail the warrant of fitness inspection that we have to obtain annually.

2. A vehicle (other than group L vehicle or a class MA or MC motorsport vehicle with a valid motorsport authority card) that was first registered in New Zealand on or after 1 May 2010 and manufactured from 1 January 1990 has a catalytic converter removed where there is evidence that one was originally fitted.

Why not get the pipes without the cat and just swapping the original ones back in before the inspection? It's a bit of a pita but you'd get better flow then punching out the cats.

[wparsons]

Why not just get a proper pipe with a high flow cat??? There are more gains from the larger piping than from punching out the cat in the front pipe.

The stock pipe is like 2 1/8", a 2.5" pipe with high flow cat will make more power across the rev range than the stock pipe with a gutted cat.

[ML]

Originally Posted by wparsons

Why not just get a proper pipe with a high flow cat???

'Cause this is free.

[uspspro]

Originally Posted by ML

'Cause this is free.

It's not free. Since one would be destroying some expensive parts.

The OEM cats are worth a bunch of money. Look up how much they cost new.

If you really want to go catless, keep the OEM stuff in a bin, get a header/test pipe. In a couple years when someone buys a ghetto mod'ed FRS for cheap, they will pay a good price for a set of OEM cats, especially in CA.

[ML]

Thank god I don't live in CA

[uspspro]

I'm just talking economics. The OEM cats a worth a few hundred. It's like throwing money away. The gains will be better with new parts.

[wparsons]

^^ This! I bet an OEM front pipe with cat is worth about twice what a catted aftermarket front pipe is.

I know on some VW's the much smaller cat pipe is like $900 from a dealership for a cat with two flanges.