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Old 04-13-2002, 06:49 PM   #1
Scooby Specialist
Member#: 13736
Join Date: Dec 2001
Chapter/Region: BAIC
Location: SF
Default Installed Exhaust.. Can I remove Heat Shield

I just installed a GReddy EVO Cat-Back on my WRX. During the install I ran into a few problems. Here are my questions:

1. I had trouble with the heat shield next to the rear diff. I tried banging and shping it, but it still seemed to buzz when I took the car around. I removed it, and realize that the pipe sits under the gas tank. Is it ok to leave it removed?

2. I also had problems intalling the exhaust around my Rear Diff Protector, so I removed it. There are four 17mm bolts that go on the side of the diff plate. I tried reusing the ones from the protector, but they are WAY to long and have a smooth shaft in the middle. The plate IS fastened on now by the four front bolts--just not the side ones. That being said: Can I safely drive like this? Do I even need those shorter side bolts??
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Old 04-13-2002, 10:26 PM   #2
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Member#: 15854
Join Date: Feb 2002
Location: Upstate NY
2002 WRX


In case you install the downpipe in the future...

I am running without a heatshield since I installed the turboback exhaust system. I also have the temperature gauge that monitors engine bay and when it gets hot, it reaches around 70celsius which I think is really hot. BTW, the temperature sensor is installed right behind the intercooler so it would be nicer to install a heatshield especially in summer time. I am sure temperature will reach around 80-90 celsius .... (100C is H2O boiling temp).
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Old 04-14-2002, 02:40 AM   #3
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but I'm talking about the shield in the rear of the car, not the front. You know, the one RIGHT NEXT (left) to the REAR differential. The last heat shield is above the muffler..ok..well the next one fore of it. How would that effect engine temps and my downpipe??
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Old 04-15-2002, 07:22 AM   #4
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Join Date: Feb 2001
Location: Humboldt County, CA
2002 Impreza TS


No, it's not okay to drive around without the heat shield between the exhaust and the gas tank, see for example the 1980 Ford Pinto, or the 1987 Chevy Nova.

The rear differential 'Protector' is just decorative, you could remove it entirely...

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Old 04-15-2002, 09:07 AM   #5
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Location: Vega$. Again!
2002 WRX Sedan

Default I had the same problems you did...

I slapped in a GReddy & golly if it didn't rub & rattle like you read about. The EVO is a big honking exhaust compared to stock & you need a shoehorn to get that thing up under there.

Bending the heat shield did no good for me. I'd take out the front left diff protector bolt (it will still stay in place). Also get some hangers that allow the exhaust to hang down in the middle section a little more. I bought some at Pep Boys for real cheap.

Let me know if you still have difficulties & we'll see what we can do to help you out. I know what you are going thru.

"Holy ****, I just dropped $500 $& it rattles llike crazy."

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Old 04-15-2002, 09:50 PM   #6
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Well...if I explode..I explode..whatever. I hate rattling. I heard it constantly on my old Si, and I'd rather die than hear continuous buzzing. I have a problem:

Ever since I put the EVO on the car seems to be a bid slower, particularly on the low-end (seems to take longer for the turbo to spool), and somewhat even on peak boost. There is a slight (1/4") gap between the flanges of the Greddy 2nd mid pipe and the Stock front mid-pipe. The Stock cat pipe ends in with a narrowing taper (wherever the term is called). The GReddy exhaust is a flat flange. The taper DID fit into the greddy pipe--and seemed to make a rather complete seal, but I wanted to be absolutely sure. I used liquid gasket sealant around the flanges, and tightened the bolts till my bones almost broke. I also used Loctite on all the bolts. The rear flanges bet. the 2nd (GReddy)midpipe and the muffler pipe are SEALED totally with the supplied gasket in between... I dunno what the problem is..

Could the larger diameter piping be to blame??

Anyone else having this problem??
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Old 04-16-2002, 10:51 AM   #7
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2002 impreza RS

Default don't explode

I wouldn't go without any shielding... try some aluminum adhesive type on the tank or at least something. It's used for atv's and dirtbikes and comes in small sheets. Put your hand on the floor of the trunk right above the muffler... Heat shields do help.
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Old 04-18-2002, 09:21 AM   #8
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2002 WRX Wagon


pintos exploded because of a cheap fuel cell used to reduce weight.
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Old 04-18-2002, 11:10 PM   #9
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Member#: 17078
Join Date: Apr 2002
Location: Waterbury, CT
2002 WRX Wagon

Default fix for the gap

I just finished installing my greddy evo exhaust and I am having some of the same problems with vibration and the heat shield. What I did to fix it is I bought some Kartboy exhaust mounts. They are a little larger and much stiffer than the stock mounts. Also that 1/4" gap everyone is talking about. That part that tapers down is a hardened rubber ring that comes off. Use a stiff putty knife and it comes right off. Then the exhaust with the washer that greddy provides fits real tight. If you have any questions feel free to email me.


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