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Re: cat/struts.....
How many miles are on your GTP?
That is a plausible explanation although it could be a bad 02 sensor (front) too. What you can do DIY is remove the 02 sensor and inspect it. You'll need a special 7/8" 02 sensor socket with wiring harness cutout...around $10.
Clean the sensor vanes with carb or throttle body spray cleaner. Reinstall and then see what it does. A bad CAT could cause a lean trim due to being clogged as will a bad EGR valve, vacuum leak, leaking fuel injector seals, etc. Nothing wrong with a generic aftermarket CAT, especially if it is a hp hi-flow. The CAT in/outlet should be around 2.25" stock.
If you have over 70K miles then new struts will help. I use KYB GR2s.
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