If you've never tried a different pipe on your Tomos, then how can you know if the torque loss is a problem. Maybe it's acceptable. It's not like putting a biturbo or whatever on is going to kill your acceleration completely.
Also, it doesn't sound like you're going to get what you're expecting for only $130.
It's kinda like the phrase about having something fast, cheap and reliable and you can only choose 2 of those. For you it'd be speed, torque and cheap or something idk.