How to open ports on router for better torrent performance

Yes, you can route certain connections on one interface and other types on another. For example, you can have all incoming traffic originating from the Internet routed through your static IP while have all outgoing traffic originating from your home go through your dynamic IP. However, the details are extremely complex and I would recommend that you read up and understand some networking fundamentals and then go on to LARTC to get more details on how to do it in Linux.

Surprised nobody noticed, but 66887 isn't a valid port number.

https://stackoverflow.com/questions/113224/what-is-the-largest-tcp-ip-network-port-number-allowable-for-ipv4#113228

The port number is an unsigned 16-bit integer, so 65535.

The valid range for ports is 0-65535.
Because you're specifying the invalid port 66887, most operating systems will truncate that to 1351:

[root@f ~]# tcpdump -qnn host 8.8.8.8 & telnet 8.8.8.8 66887
[1] 4054
Trying 8.8.8.8...
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
15:30:56.175482 IP 10.0.0.42.60280 > 8.8.8.8.1351: tcp 0

Or in C:

[root@f ~]# cat > 16.c << EOF
> #include <stdio.h>
> #include <stdint.h>
> int main(void) {
>  uint16_t port=66887;
>  printf("%d\n",port);
>  return 0;
> }
> EOF
[root@f ~]# gcc -o 16 16.c
16.c: In function ‘main’:
16.c:4: warning: large integer implicitly truncated to unsigned type
[root@f ~]# ./16
1351