I got the y pipe installed yesterday and now i hear some nasty rattle coming form underneath, I think its the black cross plate that suppose to suport the y and the exhaust. Im thinking of just taking that plate off, is it safe? Does anybody know what causing it to rattle? Anybody came across the same prob.???

 

First, make sure the Y-pipe isn't touching the floorboard. Unless you have longtubes, it's most likely the Y-pipe/catback hitting the crossmember brace that you're talking about. It's safe to trim it, but I wouldn't remove it on a daily driven car because it helps with chassis rigidity.

 

If it is the black piece you can take it off and bend it a little to get the clearance around the y you need. That is what I had to do on mine. Another thing you might want to check is on the drivers side of the y there is a brace in the floor pan that the y pipe could be very close to and hitting when the motor torques. If it only rattles under heavy acceleration its probably the pipe hitting under the drivers seat.

 

Mine has has a tinny rattle ever since I installed my loudmouth. I've looked several times but I can't narrow down what the problem is.

 

Many people have this problem and find it is the heat shield above the exhaust pipe where it crosses over the axle.

 

i had a similar problem with my bassani orp

look at this picture for a pic of where mine was hitting.

i cured it with poly motor mounts, since i was getting headers soon anyway.

and for the black plate you can also put spacers to lower it a little to prevent banging.

 

That is exactly the spot I was talking about in my first post. My y-pipe hits there too or I guess I should say my cutout.

 

i suggest prothane poly motor mounts...nearly eliminated ALL engine movement under load.

pita to install...but well worth it and NO added vibration

 

I may do that if I get those headers. I would think having all the exhaust out of the way may help a little.

 

that flat thin stamped piece of junk helps rigidity? pfft

take it off and you can bend it with your own two hands ...

i took it off on my old LT1 and ran for prolly 8 months without any noticable difference. if your really worried about it then put some washers between it and the car to space it out a bit.

the only thing i think its really designed to do is catch the driveshaft should it come flying off.

 

Thanks!! The y-pipe was hitting that black crossplate, I put it the wrong way, i had to flip it around. Problem solved

 

For future reference it is called the g-load brace. It may be flimsy but it must do something or it wouldn't be on there. GM aint puttin no parts on that aren't necessary. Evey part thqt they can do without is money in their pockets.

 

the mounts would be EASY to do with the manifolds out of the way....

i wish i had waited till i did my headers....the mounts took nearly 12 hours to do....longer than the header install took