knock, knock, knock...
Thread Starter
Safety Car
Joined: Aug 1999
Posts: 4,249
Likes: 3
From: Grovetown Georgia
Pre-cats or no?
I heard this metallic knocking sound (in the front of the car) which increased with engine rpms. I needed to replace the rear bearing anyway so I ordered them and had my mechanic check the Vette out.
Turns out that the passenger side cat on the front y pipe is bad. I've seen two replacements at Ecklers one with the two pre cats and one without.
Will running a front y without the pre-cats make the Vette louder? It's loud enough as is with the Ansa mufflers. The ads state that the front y with precats is EPA approved but an identical y on another site stated off road use only...what would you guys recommend??
Thanks
Joe
Turns out that the passenger side cat on the front y pipe is bad. I've seen two replacements at Ecklers one with the two pre cats and one without.
Will running a front y without the pre-cats make the Vette louder? It's loud enough as is with the Ansa mufflers. The ads state that the front y with precats is EPA approved but an identical y on another site stated off road use only...what would you guys recommend??
Thanks
Joe
Last edited by 90EXPVette; Aug 16, 2004 at 09:44 AM.
Race Director
Joined: Sep 2003
Posts: 16,836
Likes: 337
From: Database Error Indiana
Yes. Definitely louder. I have all my cats empty and at first its really bad. Afert about 6k miles I now like it 
. If you dont drag race I say put cats back on it. You would not notice the power diffrence on the street. Et diffrence is about .15 with no cats. You can see it on a timeslip but I dont think you can feel it. 
. If you dont drag race I say put cats back on it. You would not notice the power diffrence on the street. Et diffrence is about .15 with no cats. You can see it on a timeslip but I dont think you can feel it.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
A front Y without pre-cats along with a 3-stage cat is 49-state (left coast excluded) legal alternative to the stock setup.
You will get a hp gain from going to the new front Y with hi-flow cat.
Also, if you toss the frisbee from the front of your water pump pulley you will get a hp gain.
You will get a hp gain from going to the new front Y with hi-flow cat.
Also, if you toss the frisbee from the front of your water pump pulley you will get a hp gain.
Cruising
Joined: Aug 2004
Posts: 12
Likes: 0
I went with no precats and the 2 and 1/2 pipe. I also have an aftermarket catco main convertor and flowmaster exahust. The car shounds great. It was a little louder but sound good. For a pieced together system it sounds good. As for picking up any ponies ...maybe a couple. I had no problems withthe emission test in ohio but I don't think they know to look for the precats.
Thread Starter
Safety Car
Joined: Aug 1999
Posts: 4,249
Likes: 3
From: Grovetown Georgia
Thanks fellas the new Y is on the way! Ecklers should be shipping it tomorrow
65 thanks for the frisbee reminder, I've seen some of your other posts about it and had forgotten, it's coming off this weekend.
Joe
65 thanks for the frisbee reminder, I've seen some of your other posts about it and had forgotten, it's coming off this weekend.
Joe
