ia all the way i personaly dont own any but i have used them in customers cars and had nothing but grate outcomes and my teammate has 2 187s that he was burpin a 49.4 off of 2k and he plays them daily off of 2k and we are amaseed how long they have lasted off the power and nick at ia is a grate guy to deal with just cause of the fact of his products that ive used id say ia