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Old 05-19-2011, 11:00 PM   #1
TCAT
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Question Flowmaster American Thunder Catback Smog Legal in California?

Please excuse my modification "newness" . I have a question regarding catback legality in California. I asked this question on another thread, but I figured I post it here, because I'll learn even more from various responses.

I was thinking of getting the Flowmaster American Thunder Cat-back or the American Thunder Axle-back system. I live in California and from what I understand, it's not smog legal to install an aftermarket X-pipe or H-pipe. I was completely unaware that the Thunder Catback came with what the website says "Scavenger X-Pipe." So, basically that means it's not smog legal in Cali, correct? I thought Catbacks were okay in Cali because they DIDN'T change the X-pipe or H-pipe, but that doesn't seem to be the case. That shows you how new at this I still am, ha-ha. Am I correct in all my assumptions? I wanted the catback because of the 3" piping for future mods, but it looks like you can't keep the stock H-pipe when installing a catback, right?

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Old 05-19-2011, 11:31 PM   #2
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Last I heard as long as you do not move the cats which are before the factory h pipe your fine. Im in California my self and have the flowmaster cat back and love it. You should have no problems come smog time
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Old 05-19-2011, 11:56 PM   #3
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Thanks fire. I was pretty dissapointed when I saw that the Flowmaster included some sort of X-pipe, because I thought that was an automatic disqualification when it comes to smog legality in Cali and aftermarket X-pipes. It seems like this catback maintains all 4 of the cats (not just a couple), right? If so, I'm assuming I should be okay. Thanks again.
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Old 05-20-2011, 12:22 AM   #4
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yes as long as you dont touch the cats they are legal. I run a modified system that is just a tad bit more aggressive
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Old 05-20-2011, 01:11 AM   #5
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Excellent, thanks Buff. That's good news. I think I'm going to order the American Thunder catback tonight. Autopartsdealer.com has the kit for $633 with free shipping. Not too bad! I was also thinking of getting the Bassani Dominator GT Pro axle-back (I ordered a Bassani a while ago but the vendor had it on backorder).

There's only a couple of Bassani axle-back videos on youtube unfortunately. It doesn't seem to be popular at all on the Camaro though.
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Old 05-20-2011, 06:07 AM   #6
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You'll love the flowmasters they will drone abit around 75-80mph in sixth but its not bad at all

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Old 05-20-2011, 08:30 AM   #7
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Thanks Fire. I am looking forward to getting it installed. Many of the other catbacks or axle-backs I've listened to are a bit too raspy for my liking, and that's what drew me to the Thunder catback. I just want a deep sound.
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