I know you guys have lots of knowledge so I am seeking some answers. 1. Can anyone identify which fmf exhaust this is without the decal? 2. If I got a header for this slip on would there be any difference than getting a full exhaust? 3. I have read that the E header is a cheaper but equal alternative to a aftermarket header. Is this true and what would be a reasonable price for one in good condition? I did not see a lot on ebay. Thanks in advance for any help!